ΔE 12.9, fair: the same colour family, but not a straight swap. Dark Angels Green is more saturated, cooler than Gunship Green. They are different kinds of paint: AK Interactive Gunship Green is an opaque base/layer paint and Citadel Dark Angels Green is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Dark Angels Green is more saturated, cooler than Gunship Green. They are different kinds of paint.
The same difference applies the other way round: Gunship 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 Gunship Green on the colour wheel See Dark Angels Green on the colour wheel
All matches: Gunship Green equivalents · Dark Angels Green equivalents