There might even be different version releases of the Mystique Enhanced release comparing the foto of Nullsweat's Mystique Enhanced Version CD and one such CD shown on Mobygames:
download/file.php?id=46457&mode=view
https://www.mobygames.com/game/mechwarrior-2- … CoverId,303801/
The one on Mobygames has "English Language Version 1.1" printed on the CD while on Nullsweat's CD it just says "English Language Version".

Yes, there are different version. Actually, I've found different versions of all Mystique Enhanced releases. Most of the time, the later ones added compatibility with 2 MB cards.

I still collect MechWarrior 2 CD's so if you know the serial numbers I can check if I have a specific disc. I have 30 or more presently.

Do the serial numbers indicate a date?

Not really, but each version tends to have it's own serial from whatever OEM released it. There's also a lot of v1.0 and 1.1 discs, it's hard to track them all down. I think there may well be over 100 of them.

Wow, around 100 is a huge number of different game mediums for a game.

Not sure if any interest to anyone but I was swapping files between the PowerVR and ATI versions and somehow got MW2 to run at a lower than 512 resolution, I think, on my Rage 2. I’m guessing its 320x240. That or I’ve just forgotten what the Rage version looks like.