This made me think of a conversation I had with another autistic acquaintance. I was talking about my lifelong owl special interest and how I love the taxonomy and knowing all the genre/species characteristics, and he said that his special interest in bugs is less about collecting information and more that bugs make him really happy and that he likes thinking about them.
Since then I've noticed that some of my special interests are more intense on information collection while others are more enjoyable and helpful for self regulation. For me, owls fit into the former, while media (mostly anime/music) fits into the latter, but something like Pokémon fits into both.
It's easier for me to influence the second kind of special interest (or at least, it seems to take some conscious effort) but the first kind almost powers itself, if that makes sense.