About the mask:
It is pretty problematic because the mask is changing during the whole life of a dog. In the fact a dog should have good visible mask until it is about 1.5 years old (it is the time when most people make the bonitation with the dogs). But to be honest every year the mask is getting lighter and lighter....and all 10 years old dog have good mask...
So to talk about "genetic" we will need to see the photos of both dogs when they were young...
So far according the photos both dog will get permission to be used in breeding even in origin countries. I know even 1998-99 many dogs had still problem with the mask and I know many females which almost had black mask but were used for breeding. And it was worth because if you will choose good dog for such female you can get really good results...