Us Sailing has both boats listed as PN62.5 Why would you have to offer anything to even things out? If you add a kite then the standard multiplier is .98 but for me it would depend on the size and the wind for the day. (a 350 ft^2 chute on a light air day would be more like .97 or on a heavy air day .995) Or just race and have fun and see how it turns out.