Buttstett was the successor of Vetter in the Predigerkirche in Erfurt. It’s possible that Buttstett knew this chorale prelude by Vetter when he wrote his own prelude on the same melody (http://www.contrebombarde.com/concerthall/music/18380).
Both pieces are quite alike, manualiter fugues on the first line of the choral melody. In Vetter’s version there’s one entry of the theme in the pedals, near the end of the piece. Buttstett’s piece is contrapuntally more involved with almost all entries of the theme in stretto. Vetter’s version is somehow more emotional. But both are fine pieces.