G'day Vick, colours should be Foliage green/dark earth over sky blue. Code letters were either medium sea grey or white, some late war machines were simply foliage green over sky blue. Vengeances deployed to New Guinea would also have a white tail and wing leading edges as per my sig.
Note the period pic below shows the Vengeance's delivered with the early war RAAF roundel of red/white/blue. Once in service the red was over painted with white.
HTH