neither mod fixes the problem. The tones of the head do not match the body. i have seen this same problem in fallout 3
That's the way it should be if you're using non-vanilla textures, the tone of face and body is calculated differently by the game, this odd color difference is called "seam", the term applies to body parts that doesn't mix well (for example a hand might be smaller than the arm, or the upper body waist is smaller than the lower body waist)
Unfortunately, there's nothing you can do about this. There does exist a "body seam reducer" mod, but I forgot where it is and it doesn't really work with my custom race