Enabling post privacy gating in the Page\'s privacy settings allows creating of posts with separate Gating and Targeting.
Enable:
Make sure that gating is turned on for the page 
Make sure that you use the page token not the user token.
Then when you create you're post with the api the targeting param will perform gating while the feed_targeting param will do news feed targeting.
Note: Gating only works for language and country.