Praxagora being able to release infinite heat is already logically bullshit. No star has an infinite temperature.
Unless the context is referring to both's abilities to release and absorb infinite quantities of heat, in which case it's a moot point because it does nothing to prove Super Skrull can absorb a beam of heat as potent as what Superman can project.
I was mostly just shitting on carver, but sure, Superman could easily win with a superspeed one two buckle my shoe to Kl'rt's chin.
Do you believe people should take all dialogue at face value? Should we take Superboy stating Superman can break the planet in half with a sneeze as empirical evidence?
You know these are fictitious characters therefore anything is possible. I mean Mighty Mouse can't exist either, nor can a man fly around in space in their under-roos, and Iron Man would be torn apart by the tremendous g forces that he goes through, and yadda phucking yadda.
The dialog says that she could do it, and that he could do it. Just go with it.