Why do I keep comparing my new puppy to my deceased border collie?

Since Mikey died, I felt like a new puppy would help to heal wounds that both of us are suffering. The new puppy is a yellow Lab. I keep forgetting she is a puppy and does not know commands, yet. I find myself calling her Mikey, instead of her real name Maggie. Question: does everyone that loses a pet dog, go through this same ordeal? How long does it take for the pains to go away and will Maggie ever be the dog that Mikey was?