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).