Chosen Solution
I had some trouble recently when I bought a 2010 27" iMac off of Craigslist for cheap/parts. Turns out it was the logic board, and other than the overpriced boards sold new, the only one on eBay that was close enough was a 2009 model. So I bit the bullet for about 300 dollars and finally received it yesterday. IT WORKS! I couldn’t find any information with this exact information and was excited that it did indeed work. Hopefully this will help someone with a similar problem some time. This was NOT a C2D board that I put in, I can not confirm if that would work or not.
With the models being the same and both boards being “i” processors rather than a Core 2 Duo, I would say your odds are very good. For a better answer, I would contact www.welovemacs.com and ask them if this board - http://www.welovemacs.com/6615428.html - will work in your machine. PS give them the last four figures of your serial number when asking.