The shells are exactly the same, the Cosworth had the skirts added, different front bumper etc but that aside there is no difference, hate to say it but that is a classic ringing technique, I.E cut the VIN from a bad Cosworth and reshell it welding the VIN in the process, it could of course be genuine like in the instance they are saying.

Apparently there is supposted to be extra sound deadning in the Cosworth as well but never seen it myself.

Under the bonnet look at the plate on the slam panel to see if it's been interferred with, also if 2WD as the "Type" designation on this badge , you should be seeing "BFGC not sure if 4x4 will be the same, also check and see if the chassis number tallys here as well"

Martin