This is assuming we’re talking about basic Cavalry, if it’s camels or elephants that number looks a lot more like 40 or 45% more damage per resource because each class that matches adds it’s bonus damage. That doesn’t account for the fact that the Chu Ko Nu costs significantly more to upgrade once counting Rocketry, even if you count Pavise for Italians given how dirt cheap Pavise is. Normalized for cost, the Genoese does 14% more damage to Cavalry per resource spent than a FU Chu Ko Nu.