I have always been pleasantly surprised at how good Windows 8.x is at this sort of thing, compared to older versions.
I have done this a few times, recently helping my Son do the same when his motherboard died.
On each occasion I had been prepared, having done all the backups and driver preparation, to do a fresh format and reinstall but it hasn't been needed.
I have done it with boards of the same chipsets and then, on one occasion, a different chip set entirely.
On each machine the device manager tree and driver install has been fine and unless the board being changed to has some obscure hardware attached everything should be picked up fine.
Unless the machine has other issues etc then I would prepare with backups etc to do a reinstall but I would give it a try first to just swap the boards over and reboot.
I wasn't sure if my initial worries and concerns about doing that were related more to Windows of old where a format and reinstall was more the norm.