With an EXACT match there should be no problem.
The new mobo should have its own CD of drivers anyway in case there's a change.
The more discrepancies you have, the more chance of having to reinstall everything, though that would be the worst case.
Somewhere in the middle (I think,) you might have to boot in safe mode to install any changed drivers.
Whatever you do, back up every bit of data first, just in case.