Q Pro Carbon rear end shapes: Bikefanclub.com

I too am the proud new owner of a 'left-over' Q Pro Carbon Team in Burning Poinsettia Red. Am still making some adjustments so can't comment on the ride, but I did notice something curious. The rear end, where the carbon meets, seems to have some "ribs" in the design (presumably for stiffness, etc.)
I also have a "Nightstorm" frame/fork (unbuilt) which may be "newer" as the back end does not feature the same ribs; overall its just more plain and rounded.

So... my long winded question is: which is an evolution of which (did my "team" frameset in poinsettia red with ribbed back end precede the non-team "nightstorm" rounded back end.)

(Such a simple question and I couldn't ask it right!)

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