ΔE 13.9, fair: the same colour family, but not a straight swap. Traitor Green is a little lighter, more muted, cooler than Greatcoat Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Traitor Green is a little lighter, more muted, cooler than Greatcoat Green.
The same difference applies the other way round: Greatcoat Green is a little darker, more saturated, 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 Greatcoat Green on the colour wheel See Traitor Green on the colour wheel
All matches: Greatcoat Green equivalents · Traitor Green equivalents