I had a little PB female silkie named Minx, she was with us for 12 1/2 yrs.
They do look quite similar especially in colouring, their bones are a little sturdier than yorkies. Minx's coat would grow right to the floor and was just beautiful. I'll try to scan some pics into my computer and post them for you. She weighed about 9 lbs. (She was Tango's Mom but he's a X).