DynoDave's answer in no way helps anyone who has any genuine intrest in knowing exactally how a final drive will relate to outputted power figures.
Were both motors identical in every way? Were both run conditions identical in every way? Were both cars identical in every way? (wheels, drive-train i'd especially like to know). Did you dyno test both cars with the same final drive, and find them producing the exact same power? Until you can answer yes to all of these questions, your point is moot.
There are so many variables in this type of real world dyno testing that you can never rarely compare two outputs, unless you are simply comparing, 'figures'.
Realistically, a final drive will increase wheel torque, i.e. available power, at every car speed. If you measure power output on a non-intertial dyno, it will not change (disregarding inconsistencies), and as a bonus, you'll get higher figures to gawk at!
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