ΔE 9.7, close: similar, with a visible difference side by side. Orc Skin is more saturated, cooler than Militarum Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Orc Skin is more saturated, cooler than Militarum Green.
The same difference applies the other way round: Militarum Green 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 Militarum Green on the colour wheel See Orc Skin on the colour wheel
All matches: Militarum Green equivalents · Orc Skin equivalents