Strange escobaria found need ID

[Vanzily]

One friend who are traveling to search species in Chihuahua, ask since a while and without a concrete ID. If you think the answer, plase make a good answer telling why is this. Found in East Chihuahua. Unfortunalety, I know someone wild collectors that are trying to find the location. And for that reason I can´t tell much about it.

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Maybe at first can looks like one escobaria vivipara or something related

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But looks this species have a variable spination

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Specially the adult ones, and with the true form

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Thick petals and pale pink

[vlani]

varicolor?
Definitely not vivipara

[Vanzily]

One more shoot, showing the appressed spines, including the central ones. Only 1 central spine and turned more dark with the age

[jfabiao]

There is a Escobaria chihuahuensis that does not look too different from your plants, and your friend being in Chihuahua...