Kozak, I just recently bought a KT1. My dealer confirmed that the KT1 and KT2 are indeed identical apart from the lamp assembly. The KT1 uses the 6V N1 and hte KT2 uses the 9V N2. As dizzy suggested, you can just buy the KT1 and then buy a N2 lamp from someone to use on your C3. Or, just do what I did and just use a MN15/16 lamp. The MN15/16 were designed for the M3T but fits and works perfectly with the KT turboheads and 9V lights such as the C3. In fact, my turbohead is being used on a C3 body as I type. I think the MN15/16 lamps will be much easier to locate than the N2 at the moment. Hope this helps.