What I’ve found as I’ve worked on my own color regrade is that the shots of Ben when he first meets Luke are desaturated compared to the surrounding shots. That changes the moment they go to get C-3PO. It is the only spot I’ve found to be undersaturated when I compare it to the GOUT DVD and other sources. I don’t like the JSC because the colors seem more off than the Technicolor. C-3PO is positively orange in the first shot and from all the source material I have, he is supposed to be brassy gold (like you have him). The GOUT DVD is both higher resolution and has better colors (once you correct the brightness).
I think in many ways the JSC has more accurate colors than the GOUT, but the problem is the primitive techniques with which the source was scanned. This results in color balance issues, where there often is too much red in Star Wars (resulting in orange C-3PO), and too much yellow in TESB and ROTJ.