These Mammillarias can be tough to ID. My best guess would be that the 2nd picture is a form of M. haageana, and the first one is a form of M. hahniana. That is based on a couple of my own plants that I got with IDs that look very similar but of course not exactly like yours. So certainly consider my input as somewhat educated guesses - all depending on whether or not the original ID tags that came with these plants were correct.
These were a score at Home Depot. They were outside for $8 each. The plants are literally 8" in diameter. You bet I'm going to take you, with or without ID.