During continuous aerobic exercise your intensity level, relative to the high intensity levels that recruit your alactic anaerobic and lactic anaerobic energy systems, must be reduced so that the energy demand placed on
your muscles equals the energy supply (compare this to the alactic anaerobic and lactic anaerobic systems, where demand usually exceeds supply and energy stores are quickly depleted).
Not exact matches
Due to physiology and varying
muscle compositions, cardiac efficiency, etc. its a huge stretch to try to claim the two folks expend the same amount of
energy when they are displaced
equal (absolute) distances.
Then, weightlifting creates a lot of
muscle damage that increases post-workout metabolism because it takes
energy to repair the
muscle fibers you've destroyed while training, which
equals to even more calories burned.
More
muscle equals more fat being burned up as fuel due to an increased metabolic rate and higher
energy requirements, so that's another great reason to enhance your
muscle building efforts.