Well, I have this evening disassembled my 'Barabel' model in readiness for tomorrow's deliveries.
The body shell itself is totally compatible between the two models. However, the side panels forward of the cab are a section attached to the chassis and not the main body. They are therefore left behind when the body is removed. In addition to this, the livery details seem to always cross the line between the cab and the side panels. For instance, the B on NCB (transplant from 4wd drive version) would be cut off if it were placed on the Barabel chassis, which would also show two large red panels.
All in all, there doesn't seem to be an advantage to swapping the bodies about, as the only reason for doing so would be to get a livery change, which won't actually work
So it's out with the blue paint tonight and yes I do know what time it is