Hard to say. Design work on FO4 started immediately after Bethsoft finished FO3 and got partially sidelined by Skyrim -- or perhaps Skyrim was a smoke screen to conceal FO4's early development. Regardless, the details were well-kept secrets for years so it's difficult to say if the world building aspect is parallel development or copycat from mods or taking a little bite out of Minecraft.
-- Rat That and five bucks will get you a small coffee at Starbucks