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You can do it with 7 now and I've done it before with XP Pro although I would recommend doing a fresh install, it creates less problems and a fresh install is the way to go when changing hardware IMO.
Don't have to, and should, are two different things. I would never change a motherboard without reinstalling, unless it was the exact same chipset.
Unless it's the same chipset at the VERY least. It usually works but I have almost always eeen odd issues as a result of doing this. I've had pretty good luck so long as the model of the board has been identical like in the case of hardware failures / replacements. Even then Windows typically wishes to be reactivated.
I like to format just for the peace of mind.