As I mentioned, there were variations, but the basic patterns were adhered to, and the aircraft left the factories in prime condition, which was maintained as much as possible, allowing for the operational states at the time. Yes, as mentioned, some re-painting might be required at times, but this was not the 'norm', and certainly not the way it was 'supposed to be versus the way it really was'.
OK, the aircraft did get dirty, with dust, oil and other staining, and of course suffered the effects of the atmosphere and environment, but when time allowed, they were cleaned - a dirty aircraft can be a slow aircraft, and if anything can be done to improve performance, it was done, an example being the removal of the rear view mirror on those Spits used on anti 'Diver' patrols, which gained 4 to 5 mph.
Not all Griffon Spits (i.e. MkXIV) retained the grey/ green camouflage in the CBI.
I asked Ginger Lacey about his MkXIV, back in the early 1980s, and he was specific in describing it as Green and Brown (Dark Earth), which is supported by photo evidence of his, and other Mk.XIVs of the period.