Can I put late 2009 iMac ram-memory to a mid 2011 iMac?

Hello,
I have an mid 2011 (The newest) 27" iMac.
I have a friend with a late 2009 model which is willing to sell me his ram, (the original ones that were in his computer when he bought it).
So, I am wondering if the memory from his computer will work in mine?

It won't work
Allan

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