The problem is simple: because the volume and pressure of the two gases are the same, PV = NRT->; The product of the number of moles of two gases and the temperature is the same.

And the internal energy of gas e = inrt/2 = ipv/2-so, the internal energy of gas with large degree of freedom is more, and that of gas with small degree of freedom is less-so, the internal energy of hydrogen >: the internal energy of helium!