You didn't find anything because that's a really hard comparison to make. It's hard to make broad comparisons like that like because engines can vary from manufacturers. For instance to make a point, an OS 120 4-stroke doesn't compare to an YS 120 4-stroke. Even in the same manufacturers it can vary, an OS 46 LA doesn't put out near the power that an OS 46 AX does. Because of this it's next to impossible to make comparisons based on just size. You almost have to state specific engines that you want to compare, and from that you can gather comparisons.

Ken