G’day Woody (@wkubacki),
Looking at the black and white photo of this aircraft in the book, it is evident that the colour is not as dark as the green of the one above.
The contrast with both the red and the black anti-glare panel is more than for the green above, but not so strong that it looks too light.
There is also reasonable contrast with the white, too.
Also, “light blue” is a relative description - compared to US Insignia Blue or Sea Blue, say.
Add in fading and the light at that lattitude and colours will look lighter than on a sample card.
So why paint the aircraft blue, anyway?
Perhaps it was for operations over the sea, as they did undertake a lot of convoy escort ops.
I think your choice of 6-2 is more likely than the light 6-3.