ΔE 9.6, close: similar, with a visible difference side by side. Khorne Red is a little darker, more muted, cooler than Dark Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Khorne Red is a little darker, more muted, cooler than Dark Red.
The same difference applies the other way round: Dark Red is a little lighter, 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 Dark Red on the colour wheel See Khorne Red on the colour wheel
All matches: Dark Red equivalents · Khorne Red equivalents