Except ARB, they say that theirs will work up to 2005. Maybe they don't know about the change though.
About these differences, what can they be?
I've never seen any real differences... Whenever I catch someone with a 2002 or earlier GV I'll have a good look.
Apart from the Ford 9", how about a 4Runner rear axle? There is a 4,88 ratio that would match a front 4,88 diff from Suzuki right? Another thing would be finding them... It would probably be easier than a Ford here in Europe, though...