Replacing Logic Board with one from an older model.

Would the differences simply be in how the logic boards are put together, as in an older generation logic board could not even be placed in a newer generation MacBook? Or are there more suttle differences that might cause problems even if the logic board could be installed in the newer generation model? Differences that go beyond what is required for the logic board to be properly installed. To put it simply, if the logic board can be installed does that necessarily mean it will work?

I just reviewed the iFixit guides and there was no difference in the listed steps for logic board replacement on either the 2009 or 2010 models, and by looking at the images that go along with the steps, the logic boards looked the exact same. So like I asked in my previous comment, if the logic board can be installed would there be any underlying changes that would cause problems when booting the computer?

If you feel they are the same then give it a try. Sorry to say haven't needed to go that far. Please let us know what happens.

Success! I just finished installing a 2009 2.26 ghz Logic board 661-5230 in my 2010 13" MacBook and was able to boot it from the Mac OSX installation DVD. The hard drive was damaged when the computer was water damaged so that is all that needs to be replaced to restore it to normal working condition. The only difference I found during installation was that when replacing the heat sink I was only able to get 3 of the 4 screws to match up. The length of the heat sink was just slightly off enough to not allow the fourth screw to be placed.