Here's a non-scientific photo comparison of LHO and the re-enactment. I drew the lines on the Cappel one and then tried to line up LHO's photo with it. Not perfect of course but just to see what would happen in the two are combined:
The mismatch of those two stances becomes really obvious if you draw vertical lines from the Adam's apple to the ground. Cappel is barley leaning even though the top half of his body is cocked to one side. I think both photos need to be rotated right 2 degrees so both will be leaning a little less. Still the difference between their stances is obvious.
Question: You and others have said it would be impossible to alter the tiny 8mm images in the Z film. Are you saying they could not work with enlargements because they have to maintain the original film grain or because blowing up the 8mm film would cause too much blur? I been guessing at the reason behind that for a while.