An easy way to coordinate the greens would be to select a medium to dark green; then, to make the lighter green, simply mix the same darker green with white, maybe 1 to 1 or 2 to 1 or.... If you are using metallic green, choose a metallic white to mix with it for the lighter color. For the interior, use something like a blue, tan, or white or a print that has just a touch of the green, if you can't find the color you want.
Regardless of what we suggest, you know what you want and it will all come together in the end and everyone will be thrilled with it.