I would think that any would require careful study to see, if they worked with the 1.40 patch. If you have some mod you really like, I would think you could restore the install to the 1.31 patch and then apply it.
I do not even recall, if there are any mods for Moo2 as I never used any. The only thing needed to run Moo2 is Dosbox. All GoG did was set that up for you and patch it with 1.40. I would have preferred they not have put on any user mods/patch. Let the buyer decide that.
Sell all games the way they were and we can mod them or not.