ΔE 6.5, close: similar, with a visible difference side by side. IDF/IAF Green is more muted than Aircraft Gray Green BS283.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). IDF/IAF Green is more muted than Aircraft Gray Green BS283.
The same difference applies the other way round: Aircraft Gray Green BS283 is more saturated.
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 Aircraft Gray Green BS283 on the colour wheel See IDF/IAF Green on the colour wheel
All matches: Aircraft Gray Green BS283 equivalents · IDF/IAF Green equivalents