In a When John Williams Can't Go article I found:
And just as Alfred Newman gave John Williams some of his first big breaks, Williams, in turn, gave Thomas Newman one of his first plum assignments as a Hollywood musician.
"He threw me a bone. I mean, he would not put it that way. But he let me orchestrate a cue from Return of the Jedi, when Darth Vader dies," Newman says, then laughs: "It was an amazing thing to do."
I was wondering if this cue was exactly the one playing when Luke takes off Vader's mask. Any way of confirming this through other references or sources?