I don't think it was swapped bodies, there were 2 mod/thingys for S1 and they tuned the Demo cars to these... different chassis, i remember one as Gilles Villeneuves Ferrari 'still with the XRG bodyshell on' and a Kamaz - Paris Dakar truck, which still had the XRT body on, i think thats maybe what you are confused with, would love to see something like this for S2 though, the Ferrari F1 car for the XRG looked SO sweet, as was SO awesome!