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[nuz69]

Theoretically no. The 14XL has necessarily THINNER windings, therefore the windings heats more than the 7XL for the same amp. The thickness is lower as the turns is bigger, or the Kv lower (same space, longer windings ==> thinner windings). So theoretically a 8S 14XL setup will produce same heat than a 4S 7XL setup.
For example, a 1515/1Y and a 1515/2Y, both 4S. The 1515/2Y will run a lot hoter in current buggy or truggy setup. The 2Y needs higher voltage (8S) to run efficiently. But therefore, the resistive losses are smaller in the ESC, but you need a 8S ESC...
Higher Kv means less torque per amp (torque said alone means nothing).
Maybe, when the windings are thinner (14XL) they better fulfill the motor ? Just weight your two motor and see wich one is heavier ?