Hi Melissa. You don't live too far from me. I am in Chicago. Silky Terriers and Yorkshire Terriers are different in many ways. Here's is a little blurb:
The Yorkshire Terrier is a dog with maximum weight of 6 pounds; it has much less muscle and body weight than a Silky Terrier, and is very refined in bone. They also have a more rounded, dome-shaped skull, large round eyes and a short muzzle. A Silky will have a longer, more wedge shape to the head with a flatter skull and an almond shape to the eye. The Silky will weigh approximately 10 pounds.
Here's some more in depth info:
http://www.canismajor.com/dog/yosiau.html