Originally, with the short tail rotor output shaft, the Astar TGB forward housing was lifed too.
As for the "my helicopters better than yours" debate, Eurocopter have done almost as many add-ons to their designs as Bell. SA-360 becomes EC155, B0-105 to a EC145, SA315-EC130.
The most advanced helicopter flying today is the MH-53J Pave Low.Its not its age thats important, its what it can do and that is all about avionics...