Hi everyone: My 15'' macbook pro got a dent on the bottom pan recently and I decided to change it. But I just found out that the bottom pan that I purchased has a Model A1211, while my macbook pro is A1226. By comparing the photos on ifixit, I personally can't see any difference between these two bottom cases. Could somebody please tell me if these two pieces are interchangeable? I don't wanna dissect all the components and find out they can't fit the new bottom pan. First post here. Wish somebody can help me! Thank you guys very much!