I believe that everything that I have read, they are in fact the same hardware. But I don't know of anyone who has tried the Dell drivers with the Belkin card.
You may want to check this thread out...
http://forums.us.dell.com/supportforums/board/message?board.id=aximwireless&message.id=1311
There are quite a few posts in that thread, so it might take a bit of time to go through them all.