Mac OS X 'compress' option vs command line zip (why do they produce different results?)

Question

I noticed that the command line \'zip\' tool and Mac OS X\'s \'Compress XXX\' option (available via right click in finder) are giving different output files. Not only is the

Answer 1

The answer is in man ditto:

 The command:
       ditto -c -k --sequesterRsrc --keepParent src_directory archive.zip
 will create a PKZip archive similarly to the Finder's Compress function-
 ality.