If you use the same year as the donor/fixer, then yes, most parts will fit. The difference will be only in the interior trim pieces. Both cars were assembled side by side in the Fremont, CA plant. The main difference was in the "Badge" and interior trim parts. Both cars came off the same assembly line. This info comes from former NUMMI plant workers that assembled the cars (now unemployeed friends/workers).
http://en.wikipedia.org/wiki/Geo/Chevrolet_Prizm