ΔE 8.9, close: similar, with a visible difference side by side. Aircraft Gray Green BS283 is a little lighter, warmer than Exile Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Aircraft Gray Green BS283 is a little lighter, warmer than Exile Green.
The same difference applies the other way round: Exile Green is a little darker, cooler.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Exile Green on the colour wheel See Aircraft Gray Green BS283 on the colour wheel
All matches: Exile Green equivalents · Aircraft Gray Green BS283 equivalents