Possibly, there could be some variation in that, though were that to occure it'll simply be a byproduct of an extra or missing car, and in the same way will affect the number of spaces for sitting/standing passengers. Think how an S8 does not specifically have extra wheelchair spaces over an S7.
With nine cars in the Piccadilly line's 105m variant (assuming comparable length to 1973 Tube Stock trains), there would be more than a single car's worth of difference in the Central line's 130m version.
I think it's likely that passenger layouts (with different vent locations, floor hatches, under-seat space, etc) will broadly match underfloor requirements (distribution throughout the unit of things like compressors, motored bogies, air conditioning equipment, etc), to minimise the number of different car designs — so the technical spec might well dictate how the train gets used by passengers.