The quantity that can differ between the two gases is the mass of each gas.
Since the two gases are held at the same pressure, volume, and temperature, according to the ideal gas law (PV = nRT), the number of moles (n) is determined by those conditions. This means that the number of moles of each gas must be the same if they are identical in behavior and temperature.
However, the molar mass of the gases can differ, leading to different masses for the same number of moles. Therefore, the mass of each gas can be different.
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