Yeah, but it depends if you have the time and patience :L
Basically you have to use Hex Editor and just hex different id's for each game, so say change the MW2 ID to W@W ID and then do the same vice versa just with different games..
Well im sure that works but i never have actually tried it :/ hope you get it sorted (Y)
that doesnt work 90% of the people who ave tried it says it doesnt work the other %10 are prolly people just needing post saying it did till i see a vid of that working it doesnt lol