Hi Robert,
Point taken ... Webasto part number variations for their repair parts (and fuel pumps in particular) can send well intentioned folk down a very winding path. The very short answer is that the suitable 12v replacement pump for your HL32 diesel heater is catogued on our website as 86115A ( which may come to you showing 85106B on the pump dataplate)
https://www.butlertechnik.com/item/Webasto/heater-fuel-pump-12v-DP30-86115A-86115B-85106B/5NF
All Webasto fuel pumps from HL32 to present day have the same dose rate 'per click' - then variation part numbers are given to the pump dependent upon, among other parameters -
the source manufacturer of the pump?
whether diesel/petrol compatible?
whether supplied with a new heater, or as a repair part variations?
Electrical termination?