ID 3. I thinks thst is a M guillauminiana, but...

Please help to identify it.

maybe - Mammillaria erythrosperma ???

When I saw the first photo, I immediately thought: this might be M. erythrosperma. It looks like the plant could use some water, it seems to be quite shrivelled.
I don't think that it is M. guillauminiana.
Are the second and third photo of the same plant as in photo 1? The colour of the flowers in photo 1 fits quite well with my perception of M. erythrosperma, the colour of the flowers in photos 2 and 3 are a bit too pink, in my opinion. But perhaps, the flower colour of erythrosperma is more variable than I thought.
Are there offsets at the lower end of the plant? That would also fit well with the freely offsetting erythrosperma.

Wolter ten Hoeve.

Thanks Marek, thanks Wolter.
Second and third photo are of the same plant. Yes, there are offsets.
Thanks again.