The biggest change in ESB was the color grading. Where Hoth was originally white, in the SE it is blue. I am torn on the change, because I grew up with the SE color grade and I never hated it.
This is actually not true. The Hoth sequences were originally blue theatrically, but then turned white for the subsequent home video releases.
The “home video” colors are a real sin of a lot of OOT preservations.
Couldn’t agree more. That THX look with its flushed skintones is a cautionary tale, not a reference frame!