MAJOR COD 5 MAP PACK PROBLEM PLEASE HELP

Hello,
I need help. I recently bought map pack 1 and map pack 2 from the US playstation store, but when i go into the game the dont appear and let me play. I HAVE downloaded and installed them succesfully. My ps3 was bought in UAE and my COD5 was bought in singapore. If i buy a US disc will the Map packs work?
Thanks alot