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visably the 2wd trans will have a tail housing with a slip yoke seal at the back.
the 4wd trans will have about an 8" or so cylindrical adaptor to mate to the transfercase with 6 or 8 bolt holes in it. and no seal. just a flat gasket surface.
dont know if you can change the tail housing on the zf and put a 2wd housing on but i would suspect not. the 2wd version likely has a longer shaft in it than the 4wd version. someone on here may know for sure.
Are you looking for a 4x4 tranny. If so I found one on craigslist in florida for 300 bucks. Its in the Orlando or Daytona classifieds, I believe it was the Orlando though.