you can make calculations, but at least the graphs you posted dont add up, not by a long shot.
Or at least if its a compare between the same superchargers.
I mean at 6600rpm they make the same amount of boost.
At 6600rpm the adiabatic efficiency is 16% difference (a lot, but say its correct; it's in the graph), the overall efficiency (I calculate the twinscrew) is 60%, and the wheel hp difference is 50hp.
That means that at that point the twinscrew supercharger is consuming 125WHP/150crank (60/16*50) of power
You understand that there must be something wrong there dont you?
superchargers consume power, for sure, but not thàt much