If it's the 2-prong type key I think they're all the same...Cat has them.
Should be able to if it's like my D6...the key switch is just a battery disconnect and starter switch is separate.
It should be just a battery disconnect switch. There is supposedly a slight variation in the "old" style keys verses the "new" style. I never investigated this statement so someone may need to correct me? I do know these keys are available (probably cheaper) on Ebay.
Look at the back of the switch and D6c10k should be right in that it should have the 2 battery cables bolted on to it. Just bolt them together.