Mammillaria compressa ?

Mammillaria compressa ?;

Duars : cactus-02 : Turbinicarpus sp.? : 6 posts by 2 authors. Attachments (2).  
No ..., This is a Mammillaria. Look where the flowers are coming from, between the tubercles from the axils. Turbinicarpus (and more other cactus) will bloom from the areoles. Not really sure of the species, a bit like compressa, but not quite. I’m just not sure, but a nice looking plant. Is it part of a clump or are those individuals?
Thank you Sir for the ID and the difference from Turbinicarpus. I think those are individual plant, but I can not confirm, because it's my colleague who visited the place. Attaching a picture that suggests the place is a nursery.
Mammillaria possibly compressa
Thank you very much, Sir.