Don't quite understand your question. The colours of the Spitfire Mk1 at that period were Dark Earth, Dark Green and Sky, which you appear to have, ready to use, in Humbrol and Lifecolor paints.
There might be slight variations in tone between the two manufacturers, but there was in real life also, so not a major problem in this scale. Either of these would be more suitable than a compromised 'mix' of the Tamiya paints, and bear in mind that the photos of the models posted are being affected by colour temperature variations from the lighting used. Have a look at photos of the real thing, such as this MkV in a similar, although slightly later, colour scheme.