Mammillaria carmenae

Hello I Have known that mamillaria carmenae exists a varidad that has white thorns and another with dark thorns. I have a doubt, which is the name of both? Thanks . joma

There is a yellow spined form and another which has darker orange brown spines. They are both Mammillaria carmenae, and do not have any other separate identity. I don't think they even carry a "forma" classification, so are just within variation limits.