That's what I thought as well, but I made a theory a while back on another thread that explains how it could tie-in the Spider-Verse movies.Spider-Man: Octopus Girl doesn't really make sense to me. It's certainly not Earth-1610B because Doctor Octopus isn't Olivia. It could be Earth-616B I guess. I don't really understand how it's a spin-off of Across the Spider-Verse.
Edit: It features Sakura Spider (from Earth-346) and has flashbacks to her comic appearances with Deadpool. However, she mentions how she only recently got into this universe. I really don't think it's supposed to be connected to Spider-Verse.
Now the long part... (takes a deep breath): I wanted in fact to make timelines for most of the things in the Japanese side of this Omniverse, I am still on it, but here what I have got about connections between multiverses. There is a Japanese Video Game series called Super Robot Wars that...