[Bazooka_Joe]

What Gary said.

About 99% of MOH maps will work flawlessly with MOH:SH, unless they contain certian entities that were changed in MOH:SH. (Scorpio's Tank mod will not work in SH.)

As for the Mods/Skins, they are basically on a test-basis. You would need to load/join a server attempting to run them to see if they will still work. Mostly, blood mods and sniper scopes have been the most effected by the change to SH, but maps and skins generally work fine.