Seems likely that they are part of the same family because some of the descendants of Avraham haLevy SPITZ (b. Spitz 1656) used surname SPITZER. According to Magyar Zsido Okleveltar Vol. XIII taxpayers from Nagymarton and Kismarton included SPITZ Isak and SPITZER Marcus . Most of the off-spring of Izasak (c. 1683-1754), took name SPITZER.