I did end up using the FS numbers for my colors. These are Australian made acrylic lacquers, ready to spray.
FS36440, light gull grey, underside of plane.
US Interior Green, as on label for the interior.
FS30118, Dark Earth for the overall plane color.
FS34092, 1 part, FS34079, 2 parts. Green camo mix.
The green ha a brighter hue without being to bright, or dull.