Can I install RAM from 2011 Macbook Pro into 2009 macbook Pro?

I just upgraded my new mbp from 4 to 8gb. I have a friend with what I think is an early 2009 mbp. Can I take my two 2gb (4gb total) chips and put them in his?
Also, if his is newer, same question. I know that recently (not sure when exactly) the memory cap was raised to 8 on the mbp. So I'm wondering if it's a different kind of chip that wouldn't be compatible with older mbp's.
Thanks for you help!

You can try it, but it may not work, because your RAM is faster than what's specified for his machine. It should downclock to the speed of his system bus, but it doesn't always.
To use 8GB in an early-2009 MBP, it must be running at least OS X 10.6.6 and have the latest Apple firmware update installed on it.

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