It’s not just the sky that has been changed. The dunes were altered for the SE and they have reverted those back to the '77 version
I noticed this last night too. I didn’t realize it was the original sand though. The sky/sand replacement was 2004.
Is… is this a sign they actually went back to the 97 negative and redid all of the subsequent changes?
I have so much work to do.
JEDIT: this would also explain why it doesn’t have the mistakes introduced in 04 (Ben’s purple lightsaber, the glow added without the core, Ghost Luke).
They still haven’t fixed what is imo RotJ’s most glaring vfx error, which is that when the DS2 destroys another ship all of the stationary ships in the background roll with the camera.