For those unaware a while ago the Blast Points podcast was able to view a print of the 70mm version and confirm the differences:
https://blastpointspodcast.com/2024/01/30/episode-387-the-70mm-empire-strikes-back-experience/
I also came across this video discussing some of the changes and it seems to show some legitimate footage:
https://youtu.be/FbezmT4crf8?si=iXGhH9wa_nYl0guC