ΔE 9.9, close: similar, with a visible difference side by side. Gorgon Dark Green is a little lighter, more muted than Greenskin. They are different kinds of paint: Army Painter Greenskin is an opaque base/layer paint and Green Stuff World Gorgon Dark Green is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Gorgon Dark Green is a little lighter, more muted than Greenskin. They are different kinds of paint.
The same difference applies the other way round: Greenskin is a little darker, 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 Greenskin on the colour wheel See Gorgon Dark Green on the colour wheel
All matches: Greenskin equivalents · Gorgon Dark Green equivalents