HP's vs AP's
The HP model has "Helipilots" (anologue autopilots) and the EP model has "Autopilots" (digital autopilots) with the option of the 4th axis (collective).
The 4th axis option does not neccessarily include "auto-hover".
The Autopilot (AP) vs the Helipilot (HP) will intercept a required track or inbound radial smoother than the old helipilot system.
Then with the EP model there is the option of single or Dual Digital Flight Directors (FD's)
cheers
800