whats the difference?

[currentking]

What is the difference between these 2 acans? I am kind of new to acans and am trying to learn a little. Thanks

 

[Hormigaquatica]

Color pattern and number of polyps. Otherwise, they are the exact same species, requiring the exact same care.

 

[TIMMYE]

polyp structure looks different also and what Hormigaquatica said. But other than that they look the same.