Missed opportunity to call it apples-to-Apples ;-)
But I do wonder, given the other comments here about TDP and these days of thermally-limited performance, what the results are if both are locked to the same constant frequency.
Nah, besides crazy speculative behaviour, automatic overcloking is how modern chips are so fast compared to a few years ago.
And usually for battery power, it's often better to run really hot for a small ammount of time, that to run for a extended ammount of time at lower clocks.