For all intents and purposes, they are the same.

[ Whatever that means. ]

This world is a prison. It was not always this way. There was not always a need for a prison. That should answer your question.

[ Maybe. A war like what the Daitengu described can't happen in an enclosed world like the Hirajiro they're familiar with. There wouldn't have been any neighboring towns to have a war with. It's not the residents who changed, but the world itself. ]