Yes John, and the other big difference was that the newer Cessna 150 models had/have quarter and aft-facing windows, which are a good safety feature when, for example, you are doing steep, clearing turns prior to stalling or spinning exercises. Other main changes from the 150Bs (such as the pictured G-ARSB) and 150As were electric flaps without position-detents (instead of manual with handle-detents) and, as you say, swept fins.
You are right, I think, that these new, Rheims-built models started to arrive early in 1966, just after I did, and they represented a big expansion to the fleet. The first may have been G-ATAT, which my logbook records as a 150E. G-ATNK is apparently a 150F, but I don't remember the difference.