I would not consider inserting quick shots from TN1 for the sake of color.
I will not purely for the sake of color unless the color is unsalvagable in Harmy’s version and there is no other source. I have yet to come across a shot like this but who knows.
I will, however insert quick shots for the sake of quality and resolution, most notable during the battle of Yavin sequence where most of the space shots in TN1’s are very clean and where the jump in quality between blu Ray and gout upscales are most noticeable in Harmy’s imo. I will only do this if the shot has little to no noticeable damage on TN1’s and if the increased resolution and clarity is noticeable and improves the experience. And of course it will be color corrected to match.
I would recommend some of the more noticeable shots than the battle. Most of those are honestly great, despite being GOUT upscales. I think what needs it the most would be the sand crawler coming over the dune, the exterior shot of the cantina, and the detention block extension.