the force is applied to the piston. the larger the piston, the more force is exerted on the crank. for the purpose of the engine combo's listed, bobweight has at best a negligble effect on actual horsepower.
keep adding port cross section and flow ability and the difference between the two combo's grows. limit port and flow and the difference is little at best. there's a lot more that could be added to this but all it would do is create confusion for the most part.
lighter rotating assemblies have the ability to make more power, but in many cases people tend to negate those gains because they make poor choices in other areas of the build,IMO.