As was stated earlier, the conditions where the data is taken for the HV curve by the TPs are in straight and level flight with a prescribed delay (longer for mil certification, shorter for civ). Any interpretation of the data for landing or for the climb profiles is exactly that, interpretation.
It seems obvious therefore that in a climb the real HV curve if it were created from real data would be bigger and that one for the approach would be smaller.
But so far as I know only one HV curve is produced for helicopter type certification.