If the code's for a different region, I don't think so.
But then again, it is the same content. My only experience is with something that wouldn't be available in another region's store. --- Currently playing: Animal Crossing: New Leaf, Fable III http://tinyurl.com/kxm9d79
I think you could make an R3 account, enter the code on there and then should still be able to use the costumes on your main account (on the same PS3). --- I'd rather spend my life close to the birds than waste it wishing I had wings. Also: http://www.youtube.com/user/selite?feature=mhee