I think it's pretty obvious from looking at that fantastic side by side pic that the clamp is moved down and the grips are longer as well. I kinda figured the bulb release assembly had been tampered with in the esb photo. Everyone needs to keep in mind that several things can happen to change the full length of the flashes in these pics:
for instance on a graflex......the clamp holds the top and bottom loosely with almost a full 2mm of movement under the clamp............the MPP end cap may not be screwed down as tightly from pic to pic, saber to saber. The shroud position depends on the hole that the holding screw falls into.........may not even be in the hole in some of the pics which displaces the shroud ever so slightly. I know this sounds hokey, but having disassembled my heilands over and over, I know that these things can really vary alot and mess you up on placing grips etc.....
Dave