Both of them are beautiful, and very happy to be offsetting so well. I don't know what you've got at first look, but we'll work on it. Cacti are classified at the genus level mostly by their blooms, although there are other clues for identification. Both could be rebutias or mammilarias (or something else) so let me ask you some questions. How large are the heads and at what age did they start to offset (rebutias are small and cluster and flower
at a much younger age than most others)? Has #1 ever bloomed? If so, where did the flowers
come from (the growth point[not rebutia or mam], part way down in a not necessarilly complete circle [mam!], from the bottom [rebutia], was the flower
right up close to the plant
or did it have a stalk (if a stalk, was it smooth or spiny?). The same questions for #2, except I can see 1 flower
in probably last year's new growth. This makes me think mam except I only see 1 flower
and they generally put out multiples (but not, darn them, always).
Anyway, you've got BEAUTIFUL plants
! Don't change anything you're doing! And happy Summer Solstice!!!