So, out of the first 2 images , the latter is the enopla(true and confirmed,) and the former is its look-alike, with significantly darker, less dense spines, and more glauscent stem .
The last image should show a pulvinata and mammilaris(i hope), just need a second opinion to be certain

I can't help with the ID question, but I see a promising medusa in there (esculenta or inermis maybe?)... I love those plants! They get big and the flowers smell amazing.