Private, Commercial, and CFI have all been revised as of August 1, 2002. There are significant changes. There have been maneuvers added and new definitions for slow flight as well as the removal of minimum altitude requirements in some maneuvers. Also, there are 2 new manuevers required in the commercial PTS.
Purchase the PPL and CPL PTS books. They only cost about $4.50. Besides, would you send a student up for a checkride without current charts, FAR's, PTS, etc..? You would be cheating your students if you weren't teaching them from the current PTS.