Maybe it is already in- with some old part in a odd way:
3626BP33.DAT (Minifig Head with Messy Hair, Moustache, and Beard Pattern)
Maybe your version(which is much better) should replace this one and be coded in all three colours as three different parts:
Minifig, Head Beard Vertical Lines with Messy Hair, Moustache Red Pattern
Minifig, Head Beard Vertical Lines with Messy Hair, Moustache Black Pattern
Minifig, Head Beard Vertical Lines with Messy Hair, Moustache Brown Pattern - Stud Hollow
For the colour of the brown one I would choose dark orange 484...
3626BP33.DAT (Minifig Head with Messy Hair, Moustache, and Beard Pattern)
Maybe your version(which is much better) should replace this one and be coded in all three colours as three different parts:
Minifig, Head Beard Vertical Lines with Messy Hair, Moustache Red Pattern
Minifig, Head Beard Vertical Lines with Messy Hair, Moustache Black Pattern
Minifig, Head Beard Vertical Lines with Messy Hair, Moustache Brown Pattern - Stud Hollow
For the colour of the brown one I would choose dark orange 484...