Mostly yes. Parts of the Drawing of the Three take place here, but most is in Roland's world. He took a lot from Spaghetti westerns as well as the Poem mentioned in the Wiki, King even stated before that he took some ideas from the Deathlands
series by James Axler because he was so fond of it(this also used to be a favorite series of mine until some newer authors took over and ruined it IMO)
You should read it!