Fluctuations cubic-parallelepiped box

Does anyone know why the pressure and temperature fluctuations in a cubic box with only CO2 molecules are smaller than the fluctuations in a parallelepiped box but with the same number of molecules?

Can the geometry of the box influence the results?

Thank you

The result should be the same in both cases, in principle. However, depending on the details of the calculation, you might see small differences, in practice.