I have eloborated it many time but here u go again ...
1 - there is hardly a 0.8HP difference in both bikes but wieght difference is more then 18KG as whole and in wet condtion (Faul and Oil) the RP goes more heavy as it has a big a$$ faul tank ...
So the CG has a better power to weight better power to mass ratio
2 - RP uses 18 wheel to achieve better mileage even with greater mass/weight but that compromises its torque response hence slow/lazy pick and accelration where as CG with its smaller size and weight also has a small 17 tyre which brings all the torques created by engine directly to a very good Pull start and pick that leads to very good accelration.
I hope it helps 