The cover to Range War Westerns #4 is from the splash page of the Wyatt Earp story Vengeance of the Apaches!:
Issue #3 of the Range War Westerns series featured a Keith Chatto cover, and I expect the first two issues did too.
This issue appears to be a belated addition to the series . The increased cover price and the el cheapo cover suggest this was a quick and crudely contrived publication, and tacked on to the existing series as an afterthought.