I've used the AMUR Reaver G-10 Erla cowling on the Revell G-10 Erla kit as well as the AMUR Reaver G-6/AS cowling on the Revell G-6 kit. Here are the cuts required on the Revell G-10 fuselage to accept the AMUR Reaver cowling.
Comparatively, here are the cuts on the Revell G-6 kit to accept the AMUR Reaver G-6/AS cowling.
A few more cuts on the G-6 would get you to the same place on the G-10 Erla, assuming that the rear fuselages are identical. So I'm guessing it is do-able although I cannot confirm it.