Is there an LA on Earth-1? I can't see it being set on Earths-2 or 3 as they come across as lighter and brighter than Earths-1 & 38 even if they do have their fair share of murderous psychopaths.
I don't know that I'd call Earth 2 lighter or brighter. It's got a whole retro/iphone visual aesthetic, but in terms of actual events and people it seems a lot darker than earth 1 (Zoom, Killer Frost, Vibe, Dr Light, etc, etc).