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.
It’s not just the snow. The blue tint has been applied to the entire film & it changes all of the colors for the worse.
Yeah, even the original prints seem to have blueish snow in a few sequences (just from what I’ve seen in scan previews). It seems they wanted the whole film to have a consistently cold look in the SE.