I can confirm, that during the Mos Eisley entrance scene the orange/yellow droid R5-A2 is indeed more yellow than orange. The shot where Luke and the gang are stopped by Stormtroopers looks somewhat like this:
Bluray regraded:
That reminds me the PAL laserdiscs are indeed not too far from it, color wise:
Image taken from my first project… colors are duller in comparison, due to capture card used, capture settings, laserdisc player, inherent composite nature of the source etc.