The SE video looks different because the telecine screwed up the coloring. Everything got pink shifted. You can see this even in the new CG shots. The clips from the 1997 doc were a seperate telecine made for promotional purposes, I would guess, before the actual video master for mass production was made later that year. Thus, it would match the theatrical version better.

And yes, I am suggesting the still in the book posted at the beginning of the thread was made from a film print of some kind. It 100% not video. And I really doubt it could be an on-set photograph. It looks like it is direct from a film source.

The pre-ANH bootleg pic posted conforms pretty close to the Japanese and 1989 LD cap posted above. Brighter, with some noticeable saturation in the sky, but nothing too extreme, and not much blue/purple like in the later releases. IMO this is the best indicator of the original shot. If it is, it would also confirm that the the still photo from the book has been massively de-saturated, and also mono-toned.