Ki-15 I and C5M2 interior colors

What colors were used for the Mitsubishi Ki-15I and C5M2 ? Look like the C5M2 was Mitsubishi interior green. Ki-15 is a mystery. One reference I found quotes the painting notes for the 70s LS 1/72 kit (Reliable?) One would think the same green , but it is an Army contact aircraft. And when did the Mitsu green get standardized ?