The skyfallen hail from two distinct multiverses where they all know of each other but things are different, tiny details within their lives like the people they know or choices made. The factions have crossovers within themselves but, for example, I know nothing of the Man of Bats and he knows naught of me but what the eddas says in fiction. He knows of no heroes from any world I have been to. They have their own Earth-Prime, as we have Earth-616 which is commonly referred to by other reality-warpers and interdimensional walkers such as myself as Prime Earth.

[ Arching a brow, he squints. ]

I know much of our multiverse, Kate. I walk the space between realities, I have created one with the Infinity Stones since last you and I met, by my reckoning of time. But I do not know of their worlds at all.

So! Two main Midgards. Two multiverses.