The second is definitely Mammillaria microthele, I don;t think the epithet superfina is considered to be valid thes edays.
The first is an interesting plant, and I would say that it is from the Mammillaria dioica group of species. It could be just a straight spined form of M. dioica itself, but those are rather rare. Most likely it is either M. multidigitata or M. neopalmeri, though I favour the former. If it is, then it should start to clump up and form a nice multiheaded plant.