I'm not sure how you are going about making the color change. I just did a test and changed the values on the colorforms assigned to the Redguard race and from what I could tell the color took across face and body. Granted I had no other mods active at the time.
There was no editing of the race, actors or anything else. Just changing the value of the colorforms used by the race.
It must be that the Dunmer are different from Redguards, because when I checked every individual Dunmer to see that their tint data was what I desired, some had custom data. The hireling of The Drunken Huntsman, for example, had her own unique tint data. I changed it, and she still comes out with a different coloured body.
Perhaps you could try altering the Dark Elves or High Elves and see if you get the same error as me? If you don't, it's almost certain I have some mod installed which is causing the error, although I cleaned out the texture directory and I still get the same error.
Just so you all know, this is where I've edited the data:
tintdata.jpg 99.96KB 10 downloads
It is the right place, isn't it?