How would you differentiate between sun gods and fire gods?

So I've kinda backed myself into a corner with my god system however it's the foundation of the world so I'm determined to make it work.

So far theres two sets of sun gods bc there's 2 suns but I also want fire gods because it makes sense with my elemental system.

How would you go about designing them so that they do different things? What kind of magic would the followers of the sun gods use that isn't just pure fire? Why would people worship one over the other?

for some added context: each god is actually a set of twin gods, kind of a ying and yang thing. Also the two suns are each colder than our sun, bc otherwise I think everyone on the planet would be cooked alive lmao.