Does Prime Check for Correct Firmware Version?

[toml_12953]

Now that there are two versions of Prime firmware (G2 and non-G2) I'd like to know if there's a check preventing the wrong version from being installed. Is it possible to install the non-G2 version on a G2 or vice-versa? If so what will happen? Will it be reversible? If not, what message is displayed if I mix them up by accident? I have four Primes, three non-G2 and one G2 and I'd like to make sure I don't screw them up!