I would treat them w/ equal affection for now and in the future they'll be comfortable together and you won't have to worry so much about that.
Regarding the growling, let it be. For now. Supervize them when they're together and see if it subsides on it's own, if the puppy is learning how to properly interact w/ your Yorkie. If the pup is over the top and chaotic, I'd actually interject the puppies behaviors. Don't just chaulk it of to a puppy being a puppy. Now is the best time to start teaching manners.
Your Yorkie will thank you.
If your Yorkie seems to be taking advantage of her position and is becoming a bully, interject. If she's jumping on the couch to avoid the puppy all the time or hiding, I'd stop that too 90% of the time. Don't "push" them together, but eliminate as many "hiding spots" for your Yorkie save one. This way it encourages her to figure things out and become a socialite w/ her new room mate. But if she becomes over whelmed, she has that one spot to retreat to and not multiples to learn to be posessive and nasty about the new comer.