Some of the panels are the same and others aren't. The front guards are different as the XC has a cutout in the side in front of the wheel opening for an indicator.
THe bonnet is different in that the XC GS did not get bonnet pins, where the XB GT did. The door skins are the same on the front doors, the rear doors have a completly different cut line at the top. The XB is cut straight, where the XC has a hook in the end.
The Rear Quarters are different around the rear door opening to match the rear doors, they also have vents in the rear pillars, the XB doesn't.
I think the rest externally is pretty much the same.
Hope this helps.
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