Dragon and Helium sensors have a different pixel pitch, as such it is no longer possible to be explicit about sensor optical area by referring to the ‘K’ resolution.
S35 refers to a sensor size approximating 3 perf S35 film. This covers all DSMC1 and DSMC2 RED cameras, whether 5K, 6K (Dragon) or 8K (Helium) with one exception:
VV refers to a sensor size approximating Vistavision, or full frame stills film. This is presently only available in the Weapon Dragon 8K VV and VV Anamorphic cameras.