Erm, that's a weird one. Only problem I could see is if you have to add the RAID to the new board...Which obviously you will have to, but then I'm not sure if it will wipe all the content off the drives.
At work I've managed to 'migrate' a RAID setup to a new controller...So hopefully you can do that.
Only thing you can do is try really, plug in the new drives, in the SAME order as they are on your current setup, then go into the RAID setup on the new board and see if you can literally add the old array. Infact the controller might even pick up the existing drives and say theres a raid on them, what do you want to do type thing?
Up to you what you want to try I guess. Either way if you do get the setup working, your going to have to re-install chipset drivers and thing's arent you?