[O.B.Left]

"If two players wind up at impact separation with the clubhead, face and shaft in the exact same alignments all at the same speed and hitting the ball in the same spot on the face with every other alignment matching"

Read the question as presented.
If the ball is on the clubface for 1/2 a millisecond how they be anything but equal?

I still maintain that for both Vertical and Horizontal Hinging to both display the same speed as per the original questions requisite "clubhead, face and shaft" (which includes the butt end) you'd have to zero out #3 angle. Zero out the clubhead travel associated with the various Hinge Actions. Normally, given any #3 angle , Horizontal will have a higher clubhead speed associated with any given hand speed. Not to mention the issues of "point of contact" wobble, dynamic layback, closing, etc.

1/2 a millisecond is an eternity for the golf ball. Mb you can clearly see the ball rolling up the face in high speed (compressing , rebounding too).