No even a change of motherboard for the same model will be picked up by Windows as a change of hardware and you will have to reactivate the OS again. You will probably be able to get away with actually having to reinstall it though.
If you sent away a UD5 that should be what is returned (otherwise I'm sending my UD7 back for a UD9 ). If so there shouldn't be any difference in the chipset or other devices onboard. As long as your peripherals are the same you shouldn't have any problems.
Personally I would hold out for the same spec which would be the GA-X58A-UD5