Correct. The only parts different are the chassis, transmission, t-piece and battery plate.
Here is the conversion kit for the Madrat/Xpro:
http://www.tcmodels.net/index.php?pa...hk=1&Itemid=71
If you want to order one or need spares, Dave Dodd is pretty good at getting hold of them. I know he is also ordering some kits from Ansmann