The quantity that can differ between the two gases is:
the gas constant of each gas
This is because the gas constant (R) can vary depending on the type of gas, while the other quantities (molar volume, number of moles, and mass) should remain the same under the same pressure, volume, and temperature by virtue of the ideal gas law. The difference in gases may lead to variations in their molar masses, thus affecting their mass if the number of moles differs. However, with identical conditions, the individual gas constant for each gas can indeed differ.