M.R.
Well, there is sort of something magical about meat when we're talking protein. Animal products have all the essential amino acids that the body is incapable of making. Plant products (with the exception of only a few, like quinoa) only have 1 or a few of the essential amino acids.
Dairy is an animal product and thus will have all the essential amino acids needed for growth and repair. No need to worry about a difference between the two as far as protein is concerned.