actually based on the fundamentals, I would say not to place too much stock in the pure numbers. tire & wheel weight, gearing, rolling resistance of the tires, environmental conditions, etc. prevent chassis dynos from being a good measure of one engine purely against another. honestly given the same model of car, trap speed at the drag strip would tell you more about peak HP and area under the torque curve in the powerband.
but clearly we can safely draw some conclusions about the SHAPE of the curves. no problem there.