Four last Mamms for ID requests

These five Mammillarias are my plants growing in Brazil, bought from the local market. I have suggestions for names, but I am have not inked the names in as confirmed:

1. Mammillaria backebergiana?


2. Mammillaria haageana?


3. Mammillaria heyderi?


4. Mammillaria ?

4. Mammillaria polythele ssp obconella?

3 is a heyderi, and 4 is obconella, but not sure about 1 or 2. I don't think 1 is backebergiana but a side view would help and 2 isn't great photo, it could equally well be F#formosa or haageana.

Thank you. I should get to see them and take new photos in a week.

In Brazil, polythele obconella and polythele inermis are currently in flower. But I find I have 5 Mamms here just starting to bud (not plumosa), so I hope they do not progress too quickly and will still be flowering mid March.

Not easy to see no 1, but could it be M. densispina fa? No 4 definitely obconella. No 2 poss haageana var conspicua.

Thank you.