ΔE 7.1, close: similar, with a visible difference side by side. IJA Grey Green is more saturated, cooler than Gargoyle Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). IJA Grey Green is more saturated, cooler than Gargoyle Grey.
The same difference applies the other way round: Gargoyle Grey is more muted, warmer.
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 Gargoyle Grey on the colour wheel See IJA Grey Green on the colour wheel
All matches: Gargoyle Grey equivalents · IJA Grey Green equivalents