I am currently trying to migrate out project from RichFaces 3.0 to PrimeFaces 6.0, but I did not find some components in PrimeFaces like these.
Following Richfaces to PrimeFaces Migration Guide was written by me as instructions for my colleagues. It partially answer your question, but maybe can be useful for other developers with similar problem.
Libraries
Remove
-   richafaces-core-version.jar;
-   richafaces-rich-version.jar;
-   richafaces-a4j-version.jar;
-   cssparser-version.jar;
-   guava-version.jar;
-   sac-version.jar.
Add
-   primefaces-version.jar.
Configuration
In web.xml remove richfaces and ajax4jsf related contextual parameters
    org.richfaces.skin 
    #{lookAndFeel.skin} 
    
 
    org.richfaces.enableControlSkinning 
    false 
 
    org.richfaces.enableControlSkinningClasses 
    true 
 
    org.richfaces.fileUpload.maxRequestSize 
    524288 
 
    org.richfaces.fileUpload.createTempFiles 
    false 
 
In web.xml add
    primefaces.FONT_AWESOME 
    true 
 
    woff 
    application/x-font-woff 
 
    woff2 
    application/x-font-woff2 
 
    primeFacesFileUploadFilter 
    org.primefaces.webapp.filter.FileUploadFilter 
    
        thresholdSize 
        1048576 
     
 
    primeFacesFileUploadFilter 
    Faces Servlet 
    
 
XHTML
|            | RichFaces (change from)              | PrimeFaces (change to)            |
|------------|--------------------------------------|-----------------------------------|
|Any xhtml   |xmlns:a4j="http://richfaces.org/a4j"  |xmlns:p="http://primefaces.org/ui" |
|            |xmlns:rich="http://richfaces.org/rich"|                                   |
|------------|--------------------------------------|-----------------------------------|
|Listener    |a4j:actionListener                    |f:setPropertyActionListener        |
|AJAX        |a4j:ajax                              |p:ajax                             |
|Button      |a4j:commandButton render="xyz"        |p:commandButton update="xyz"       |
|Link        |a4j:commandLink                       |p:commandLink                      |
|JS function |a4j:jsFunction                        |p:remoteCommand                    |
|Media output|a4j:mediaOutput                       |p:graphicImage, ...                |
|Output area |a4j:outputPanel                       |div or p:tab or p:outputPanel      |
|Parameter   |a4j:param                             |f:setPropertyActionListener,f:param|
|Region      |a4j:region                            |h:panelGroup or p:fragment         |
|Repeat      |a4j:repeat                            |p:repeat                           |
|Status      |a4j:status                            |p:ajaxStatus                       |
|------------|--------------------------------------|-----------------------------------|
|Accordion   |rich:accordion                        |p:accordionPanel                   |
|Accord. item|rich:accordionItem                    |p:tab                              |
|Autocomplete|rich:autocomplete                     |p:autocomplete                     |
|Calendar    |rich:calendar                         |p:calendar                         |
|Sub-table   |rich:collapsibleSubTable              |p:dataTable (nested)               |
|Column      |rich:column                           |p:column                           |
|Button      |rich:commandButton                    |p:commandButton ajax="false"       |
|Command link|rich:commandLink                      |p:commandLink ajax="false"         |
|Control     |rich:componentControl                 |JS function                        |
|Data grid   |rich:dataGrid                         |p:dataGrid                         |
|Data scroll |rich:dataScroller                     |remove (use paginator attribute)   |
|Data table  |rich:dataTable                        |p:dataTable                        |
|Sub-menu    |rich:dropDownMenu                     |p:submenu                          |
|Editor      |rich:editor                           |p:editor (p:textEditor in PF 6)    |
|File upload |rich:fileUpload                       |p:fileUpload                       |
|Focus       |rich:focus                            |p:focus                            |
|Google map  |rich:gmap (RF3)                       |p:gmap                             |
|Hot key     |rich:hotKey                           |p:hotkey                           |
|Spinner     |rich:inputNumberSpinner               |p:spinner                          |
|List        |rich:list                             |p:dataList                         |
|Menu item   |rich:menuItem                         |p:menuitem                         |
|Message     |rich:message                          |p:message                          |
|Messages    |rich:messages                         |p:messages                         |
|Panel       |rich:panel                            |p:panel                            |
|Panel menu  |rich:panelMenu                        |p:panelMenu or p:menu              |
|Menu item   |rich:panelMenuItem                    |p:menuitem                         |
|Pick list   |rich:pickList                         |p:pickList                         |
|Popup       |rich:popup                            |p:dialog                           |
|Select one  |rich:select                           |p:selectOneMenu                    |
|Tab         |rich:tab                              |p:tab                              |
|Menu bar    |rich:toolbar                          |p:menubar or p:toolbar             |
|Menu group  |rich:toolbarGroup                     |remove                             |
|Tooltip     |rich:tooltip                          |p:tooltip                          |
|Tree        |rich:tree                             |p:tree                             |
|Tree node   |rich:treeNode                         |p:treeNode                         |
|------------|--------------------------------------|-----------------------------------|
|Label       |h:outputLabel                         |p:outputLabel                      |
|Input text  |h:inputText                           |p:inputText                        |
|Input secret|h:inputSecret                         |p:password                         |
|Message     |h:message                             |p:message                          |
|Messages    |h:messages                            |p:messages                         |
|Text area   |h:inputTextarea                       |p:inputTextarea                    |
|Dropdown    |h:selectOneListbox                    |p:selectOneMenu                    |
|Select one  |h:selectOneMenu                       |p:selectOneMenu                    |
|Multi-select|h:selectManyListbox                   |p:selectManyMenu                   |
|Check box   |h:selectBooleanCheckbox               |p:selectBooleanCheckbox            |
|Check boxes |h:selectManyCheckbox                  |p:selectManyCheckbox               |
|Radio button|h:selectOneRadio                      |p:selectOneRadio                   |
|Button      |h:commandButton                       |p:commandButton ajax="false"       |
|Regular link|h:commandLink                         |p:commandLink ajax="false"         |
|Image link  |h:commandLink                         |p:menuitem                         |
|Link        |h:link                                |p:link                             |
|Column      |h:column                              |p:column                           |
|Spacer      |  |p:spacer                           | 
|------------|--------------------------------------|-----------------------------------|
|Repeat      |ui:repeat                             |p:repeat                           |
|------------|--------------------------------------|-----------------------------------|
|Field set   |fieldset                              |p:fieldset                         |
|------------|--------------------------------------|-----------------------------------|
CSS
RichFaces and JSF 1.x related styles should be deleted:
.msginfo {
    background-image: url(../images/info-icon.gif);
    background-position: top left;
    background-repeat: no-repeat;
    height: 20px;
    padding-left: 20px;
    padding-bottom: 5px;
}
.msginfo td {
    height: 20px;
    padding-left: 20px;
    padding-bottom: 5px;
}
.msgwarn {
    background-image: url(../images/warning.gif);
    background-position: top left;
    background-repeat: no-repeat;
    height: 20px;
    padding-left: 20px;
    padding-bottom: 5px;
}
.msgwarn td {
    height: 20px;
    padding-left: 20px;
    padding-bottom: 5px;
}
.msgerror {
    font-weight: bold;
    background-image: url(../images/error-icon.gif);
    background-position: top left;
    background-repeat: no-repeat;
    height: 20px;
    padding-left: 20px;
    padding-bottom: 5px;
}
.msgerror td {
    height: 20px;
    padding-left: 20px;
    padding-bottom: 5px;
}
.inputRequired {
    background-image: url(../images/icons/input-required.gif);
    background-position: top right;
    background-repeat: no-repeat;
}
.rf-trn-sel {
    background: #FFFFFF !important;
}
.rf-trn-ico {
    height: 0px !important;
    width: 0px !important;
}
.rf-trn-hnd {
    background-image: url(../images/spacer.gif) !important;
}
.rf-pm-top-itm-ico {
    width: 0px !important;
}
.rich-menu-item-hover {
    background-color: #FFFFFF;
    border-bottom: 1px solid #8DC63F;
    border-top: none;
    border-left: none;
    border-right: none;
}
.rich-menu-group-hover {
    background-color: #FFFFFF;
    border-bottom: 1px solid #8DC63F;
    border-top: none;
    border-left: none;
    border-right: none;
}
.rich-menu-list-bg {
    background-color: #FFFFFF;
}
.rich-table-subheadercell {
    white-space: normal;
}
.rich-list-picklist-button-content {
    font-size: 12px;
}
PrimeFaces related styles can be added (if needed). In GUI following styles were redefined:
.ui-widget, .ui-widget .ui-widget {
    font-size: 12px;
}
.ui-panel .ui-panel-content {
    padding: 0.5em 0.5em;
}
.ui-dialog .ui-dialog-content {
    padding: 5px 5px;
}
.ui-accordion .ui-accordion-content {
    padding: 5px;
    border: 1px solid #ccc;
}
/* baseline does not work for selectOneMenu, top or middle vertical align should be used */
.ui-selectonemenu {
    vertical-align: middle;
}
input[type="text"][disabled] {
    color: #000000;
}
Images and Themes
Some images can be removed: error-icon.gif, warning.gif, info-icon.gif, spacer.gif. PrimeFaces has internal images for the same purpose.
Skin.properties file can be removed, as themes in PrimeFaces configured in different way.
Java
Data model for data table should be changed to LazyLoadDataModel.
Data model for picklist should be changed to DualListModel.
Type of change event for pickList should be changed from ValueChangeEvent to TransferEvent.