I am pretty sure they have the same drives. they are both 2.5" laptop drives.
I was able to use my macbook pro's HDD into a friend's white macbook.
Make sure you use time machine to back up your current drive, this way you can restore everything to your new HDD.
Does it even back up the OS? I tried doing all this once on my old eMac, and I lost just about everything. Of course, this was back in Tiger/Leopard days, and I didn't have the disk anymore. Now I'm just frightened that either of us will lose our Lion.
I'm still kinda shady on how to do it all when it comes down to saving the MBP's 500gb info and transferring it all to the new 750 HDD. I can wrap my mind around saving the white Macbook's 250gb info to time machine/external hard drive, installing the new-to-me 500 HDD and clearing it completely using disk utility. But then I get hazy again on using time machine to put the stuff from the 250 onto the 500 HDD. Sorry, but as I've never done this before, this seems like a mind-fcuk to me!
I'm checking out ifixit.com, but this is the kinda stuff you just don't wanna mess up. Do you know of any other more comprehensive manuals to use? I think I have an enclosure, but I don't know if either hard drive would fit into it and I wouldn't know how to use it even if it did. It was given to me.