This was taken from this website
http://www.shooterdog.com/alexfaq3.htm "Actually, the "Chocolate Yorkie" is an overload of red gold and is a mutation of our breed and should not be bred as it is a complete loss of pigment. Notice that the nose is liver colored and that there are no black eye rims on this puppy.
It is my understanding that AKC has many colors on their list that will allow almost any color Yorkie to be registered and the parent Club is working to disallow that. I have been approached by people who have registered this color, even though it is incorrect for our breed. There is no reason that they cannot be placed in a loving pet home and live a good life, but they are definitely a mutation to our breed and not in line with the Standard we want to withhold.
Those that advertise this color as RARE are being dishonest in that they are just trying to enrich themselves with more money, in spite of the lack of pigment in the dogs they produce which could bring a genetic nightmare to the breed. Don't be taken in by this false advertising."
So my thoughts are if it's just like a regular yorkie, but without pigment, hair texture would remain the same.