I think that the stock RG colors for MOST reps can pass off as gen ones to be honest.Really helpful thanks!
So no real need to replate in general
Of course, there are colors which are totally off (way too reddish or yellowish) but in general, the rep factories got the colors to an acceptable range I think. You can of course replate them to the color you PREFER but it will definitely not be the only color which resembles gen.