ΔE 7.9, close: similar, with a visible difference side by side. IJA Grey Green is more saturated, warmer than Gray Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). IJA Grey Green is more saturated, warmer than Gray Green.
The same difference applies the other way round: Gray Green is more muted, 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 Gray Green on the colour wheel See IJA Grey Green on the colour wheel
All matches: Gray Green equivalents · IJA Grey Green equivalents