The first-order approximation of the efficacy – glucose clearing effect – is the area under each of those plots. They all look roughly the same to me.
Of course, the body doesn’t work this simply, so that rough approximation will be incorrect in any precise way. For example, the efficacy of insulin is affected by the BG level itself, so the more concentrated insulins allowing BG to hang around at higher levels early on could blunt the overall effect, requiring more overall in terms of unit quantities to achieve the same result.
DISCLAIMER: This is all speculation. Informed, but still speculation.