He reminds me of Jackson -- I get the "Is he a Silky?" comment almost everywhere we go! I honestly didn't realize that many people knew what a Silky was, LOL. Even my groomer thinks he's a Silky.
After some research and looking and photos, Jackson
does remind me more of a Silky. He seems to have more of the Silky face, he's got the longer body and coloring, even some of the personality traits I've read. But I really don't know. Size isn't the only thing to contribute... a lot of Yorkies are larger (even coming from small parents) and Yorkies have been bred down over time so there's always the possibility for them to be bigger like they used to be. But to answer your question-I really have no idea! lol. I can hardly tell the 2 apart because so many Yorkies aren't bred to standard nowadays so alot look like Silky's even if they know they aren't. Congrats on him by the way! Cutie!
American Kennel Club - Silky Terrier American Kennel Club - Yorkshire Terrier
Silky-
Silky Terrier Dog Picture Image
The first pic below is a Silky from googleimages with the show dog hair. Second pic is Jackson.