Your caption for "sw4-sc163.__.sh06-lukehaze.jpg" aka "Shot is either shifted a few frames, or at the beginning it is zoomed in originally" is incorrect. Look at the front square of the helmet, above the nose. If you look at the bottom part of the block, although it's hard to in the your screenshot, you'll see that you can see more of it in the 1997 version. Most likely a different angle or they chose a frame or 2 earlier to start it at, or an alternate take. It could be an alternate take for the 97 version because Luke's front teeth aren't showing, but they can be see in the 1977 screenshot.