Evo - you are correct. The H was dropped. Designer Chris (H)eintz moved to Canada in the early 70s soon after desinging the HR range. Wasn't a success at the time so I believe but doing okay now!
Chris is designing the Zenair/Zenith Air range of kit a/c now.
AFAIR, the lastest variants of the 200 feature a new wing shape (ported I recall off the 3000), outboard landing lights on the port wing tip and a dagger board beneath the tail.