German engines and RAF engines have never really been all that par with each other. German designs were really meant to minimize the amount of precious metals they consumed, as Germany had little access to replace it. They squeazed more horsepower out of less space, often sacrificing aerodynamic consideration. The RAF could afford to tackle a resource-rich design and make it larger, then smooth that over with aerodynamic panels. Comparing them at similar power may yield similar results, or you may be nowhere close. Too many variables to just list horsepower.
An interesting question would be, how much THRUST did they have? 410s had larger prop blades, I believe. Yet, they are still slower. It must really be clawing it's way throug the air compared to the Mossie.
Like I said, I think the drag is really the answer. Compare a P-38 to a 110G, and I think you get the same comparison as a Mossie to a 410. One sleek, smooth, curved, rounded, the other just sheer brutality.
It has an elegance, don't get me wrong. But "slick" it ain't.