@Sameul - The original poster was working with a 13" MacBook Pro which did have major changes.
The 15" MacBook Pro 2010, 2011 & 2012 all have seen only slight alterations mostly the CPU was updated across these.
Here's the IFIXIT guides for these: MacBook Pro 15" Unibody carefully review each logic board between your system and the one you want to get.
Make sure the connectors are in the same location as well as the mounting studs. There are a few that the studs & fans are not exactly at the same location which prevents you on using that logic bd.
I strongly recommend you stick within the series your system is part of, these are the same.