All have the same cocking design principles. For me the primary odd one out is the over barrel Westley Richards Highest Possible as all the others are concentric.
That said, the cocking design was started with the 1st Highest Possible. The Highest Possible Concentric evolution was then remodelled (borrowed ) by the Tell 2, Acvoke and Thunderbolt.
Fascinating stuff.
Tell 2 could also be odd one out as only one that is German. Also only one with wood grips. Likely there are others.
The Westley Richards Highest Possible Concentric is a beauty. Very privileged to get my hands on one.