The setting that has both superpowers and magic usually put a distinction between the two...
It is a very vague distinction, since there are superheroes with explicitly magical powers, but distinction nevertheless.
Superpowers are usually one of the kind of product of the freak of pure chance ...
In fact, people with the superpowers aren't supposed to have powers, but they got it, by the random, and usually impossible event which is more likely to kill people than anything else. Radioactivity, spiders, chemicals, radioactive spiders, etc. were supposed to kill the protagonist, but the ... universe glitched basically ... and now, the protagonist has superpowers. They could be the powerful, but also unique. It's a glitch, you aren't supposed to have those powers. There is no actual culture, no lore, nothing. It's a glitch. The bite of the radioactive moderator will kill others, it's a freak chance it glitched on you.
...but magic is different.
Magic isn't gained through the glitch in the system. It's learned, it has its own culture, lore, its own mythology, its own method, and could, and should, be reproduced. Methods may be closely guarded, or nearly forgotten, but you didn't get them by the pure chance. Perhaps you found the Forbidden Book of Tentacles by pure chance, but that book could be given away, spells could be casted by more people, and usually, also used by you as well as against you. However, you memorized the incantations from the ancient grimoire or made the pact with the mystical beings, but whatever you did, it could be reproduced, once the one gets the hand on the ritual or the book.