Three Mammillarias that need identification

I am having difficulty in the correct identification of these 3 Mammillarias. Mammillaria decipiens ssp albescens I think is one of them and the other is mammillaria camptotricha marnier-lapostollei and the other mammillaria camptotricha ? However which is which ? Or maybe some other name ?

Andreas

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i think that the first plant could be a cultivar named marnier-lapostollei.
some deutch growers label this cultivar "delapostolle".
the second plant could be mammilaria decipiens ssp albescens for the little number of subcentral spines.
the third could be mammillaria decipiens ssp. camptotricha, "bird nest cactus".

Without seeing the plants in flower....I would say Maurillo has called it correct.

Thanks for identifying what is what. Is there a sure way to tell the difference between the 3 types from a word description? Are there any characteristic traits that can identify each one in a unique sort of way ?

Andreas