@goatsarah They both probably draw from similar sources in many ways. I’d be surprised if there aren’t some Twilight Zone episode or similar around.
And while sharing a lot, they also are by all means distinct. Does feel like a copy, just shared inspiration. Which is good.
That said, Fallout was the spiritual successor to Wasteland, which isn’t a vault thing but more generic post apocalyptic. I still have my C64 original :)