by Andrew on Tue Jul 31, 2012 10:39 am
It doesn't matter if both saves are present in your Documents folder. The conflict will occur in the game folder, where the art updates will be placed.
If you want to use a couple of different complete update/conversion mods without any conflicts, then the easiest method would be to make a copy of your NBA Live 08 game folder and place the files for one mod in one game's folder, and the files for another mod in the other. Running the game from either folder would allow you to play NBA Live 08 with the respective art updates for the mod; you'd just have to load the appropriate roster.
As Dc311 said, there's no guarantee of compatibility when you mix and match updates, particularly big updates like that. There's probably going to be at least some overlap.