Is Amazon FBM essentially the same as eBay?

I’ve been reselling on eBay and Mercari for the past two years. I’m thinking about expanding to Amazon. I’ve done some research on FBA And FBM. Essentially it seems that if I were to sell on Amazon FBM, it would be similar to eBay where I handle everything vs FBA where Amazon handles it. Is that correct? I see the benefits of FBA but I also see the benefits of fbm as well.