The discrepancy in how much a person can lift on Earth and in Mars is due to the difference in the acceleration due to gravity in both planets.
Dependence of Weight on the Acceleration due to Gravity
Although, the physical Quantity, mass is always constant as it is a measure of the quantity of matter in a body. The weight on the other hand is a function of the acceleration due to gravity and hence is different in different planets.
On this note, it follows that a person can carry 270kg mass on earth and 440kg mass on Mars.
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