I think the FWD's had interchangeable end covers to a certain degree, within certain frames.
My two transmissions shown were (the one with the end guts missing) the 1989 Plymouth Colt (C53A turbo KM210) as original to the car as far as I know, with nearly 183,000kms and very worn fibrous syncros in second and third, and secondly the other KM210 came from Virginia and was reported to be a turbo Mirage trans) but had the different end cover plate thing. Neither had the wave spring I was looking for, so it must have been the F5M33 FWD DSM trans that I have now installed that was coming back from my memory.
The 89 Colt/Mirage trans should have fibrous syncro liners which are great for holding/slowing engagement of the syncronizer and gear, so easier on the shifting persons arm but they do wear out faster given a high abuse over long term type scenario. 90 DSM transmissions were like this too. When I had the fifth gear syncro for my original trans out (the one with guts missing) I noticed it had the grooved style syncro and no fibre ... so it is leaving me kinda perplexed!
Keep in mind that a 1993 FWD DSM transmission if turbo, will have switched to a 27 spline count open differential. You can swap in any differential FWD or AWD to the transmission, so that part is good, but the AWD uses ball and cage and requires a substantial amount of shimming, so food for thought before you go that route. I run the AWD front diff setup in my FWD trans, and it works great and as I suspected it would after I had a local trans shop set the preloads and shim the center differential. AWD Galant and CSM's share the 25 spline count axles for front axles. DSM turbo axles switched at 92.5 MY or production date.