Is it just cosmetic difference ? Or do the recievers or action parts differ?

i've had 2 whitworths and i think 4 mark x's and all were zastava actions. the only difference i ever noted was the 375 whitworth was a later one and had a side actuated pushbutton floorplate release instead of a guard bow release. otherwise were identical, used same scope bases, same inletting, etc. cosmetic.

there once was a "churchill" 1 of 1000 or some such rifle that - to me anyway - looked identical to a whitworth and i think was also made on the zastava actions but i assume was finished out in england as those sell for a lot more when you see one.

The whitworths seem to be finished to a better quality than the run of the mill MarkX. Not so much that you can't get there from a markX, just a hair better.

the whitwork stocks are probably the better of all the ones that were factory for the markX actions.

Push button or in the bow release, the actions are engineeringly the same.

jeffe