Changing memory

I have 2 X 2gb DDR3 memory that i am taking out of my Macbook pro (putting in 2 X 4gb memory). Can i safely put in the Macbook pro memory into my Macbook? There is a mhz difference...the memory from the macbook pro arte 1333 mhz, and the macbook had 1050mhz (something like that, i forgot the mhz for the moment)
I don't want to screw up my macbook, just looking to utilize the 2gb memory.
Thanks,
James

You can try and see if it will startup.  Macs are notoriously sensitive to their memory, but since it is Apple supplied memory it might work.  Memory of a higher speed will often work, not at its rated speed, though, if it is of sufficiently high quality.
The worst that will happen is the machine refuse to start, either with a kernel panic or three beeps indicating a memory problem.

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