I won't tell if you don't!
If I need to mix it, I normally make a light green from Humbrol 30 or 163 Dark Green and White, and add a spot of mid grey until it looks right!
Obviously, if using other paints, then the equivalents can be used. Even if I use Humbrol 78 (their version of Cockpit Grey green) I normally add a touch of white.
No problem though, it still looks the biz. Do Eduard provide the 'basket' type seat base? My kit is so basic, I'll need to make almost all the internal detail, including seats, as the kit parts are -er - 'chunky' to say the least!