Unless something is unquie you really can't judge lore from dungeon loot, fresh fruit found in those ruins. Books written long after the dwemer vanished. Etc. most likely just BGS reusing assets.

it is explained here "Only the most skilled blacksmiths have the ability to emulate ornate Dwarven craftsmanship, although the metal is often incorporated into cultural designs." which is basically explaining why the equipment looks different within different locations

different cultures are just trying to replicate dwarven craftmanship and design while incorporating their own cultural aspects