Going over to the G model, they went with the KG13 (A/B/C), and as such, the electrical schematics and connections changed with it.
As the electrical coding changed (and the connections different), the KG12 could not really be installed correctly.
Technically one "could" be installed...but it would take some re-wiring.
Very, very highly unlikely it would be a G with a KG12.
Mike