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I undertand about the rust part, but it also doe look like he has tan on him as well.
He is a rescue, so not much is known about his past or his care.
I cannot see your pictures that you posted, but I am the owner of 2 CHW Bi blues myself, I'll just leave you with this picture and see what you have to say but did the dog look like this?
http://i1081.photobucket.com/albums/j343/LunaBear879/photo-5.jpg
If so then he most likely is a bi blue, that pic above is my pups father. He also was a bi blue
I would go so far as to not even call it a color headed white. It's a piebald. To much color for a color headed white.