How are autistic and ADHD hyperfixations different? How do they interact?

I've known most of my life that I'm autistic, but I've only considered ADHD for about a year. I know autistic people often have hyperfixations, and I've heard that this can happen for ADHD people too. I was wondering, how are hyperfixations different for autistic and ADHD people, and how do these interact for AuDHD people?

For me personally, I often hyperfixate on one or a few things at any given time. These can last for months, or even years. Sometimes, a hyperfixation fades, then comes back later (most notably, I've hyperfixated on Minecraft for over 10 years, but not constantly). When I don't hyperfixate on something, I can seriously struggle to focus on it at all, which I'm guessing has to do with ADHD.