The AG200 was similar in function, but a different bike altogether. The TW200 was imported for some time, and Deus has indeed turned a ton of them into customs that look great, but kinda take away from how a lot of us use ours.
As mentioned, though, the output shaft is longer. You should search for member Ronnydog to see how he interchanged some parts to get more displacement out of his TW. That might give you a few tips as to how you could get the XT's motor to work for such a wide tire. Study the BW series as well for an alternative way to get your power to the rear wheel.
It's always doable, just not always practical. If you have anything less than the ability to get some parts fabricated and a good garage to work in, it would probably be easier to just track down a TW.