ΔE 8.0, close: similar, with a visible difference side by side. Gorgon Dark Green is more muted than Aeldari Emerald. They are different kinds of paint: Citadel Aeldari Emerald is a one-coat contrast-style 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 8). Gorgon Dark Green is more muted than Aeldari Emerald. They are different kinds of paint.
The same difference applies the other way round: Aeldari Emerald 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 Aeldari Emerald on the colour wheel See Gorgon Dark Green on the colour wheel
All matches: Aeldari Emerald equivalents · Gorgon Dark Green equivalents