i believe they both share the same chipset, the 865. So a reinstall would not be needed. Though, if you wanted to be safe, you could always revert back the the default windows ide drivers before you switched boards.
btw, I can't seem to find it, but I know there's a guide explaining how to switch boards ( if you want to be really careful) floating around the arstechnica.com forums. Hope this helps.
~joe