I feel pretty sure they are yorkies! Since I don't know how large the basket is, I can't even hazard a guess on size. But they look all yorkie to me! This is how they look about a month old!
When I was growing up we had a litter of dachshunds and they start out looking like yorkies too -- black & brown dachshunds, rotties, and dobermans, all look just like yorkies when they are
newborn. Each week they start looking a little different. I think the ones in the link are probably @ 4 weeks old.
Take a look my yorkie pups in a basket! I can assure you they are all yorkie too.
Here is a good link to see yorkies from birth to adult:
pictures Unfortuntely they have the fewest examples of the 4 week size.