Hi there,

yes, it has already been proven. You're right, the DC/Faces/Gout master of SW is closer than the earlier video transfers in the scene with R2-D2 in the canyon, it should be twilight as you can see on the in-theater-reference pictures back in this thread and that is also the case on the '81 re-release prints as they only spliced in a new crawl on those, I'm not sure but there was probably new prints made for the re-releases as well, but that a new supervised colortiming was made on those isn't likely.

You could see the same thing on many early video releases from the 80's where scenes shot day for night wasn't accurately done for home video, in JAWS, I remember that the opening shark attack was often in broad daylight for example. However, the Gout master is heavily red tinted in those scenes, more so than in the rest of the film.