ΔE 10.5, fair: the same colour family, but not a straight swap. Transparent Burgundy is cooler than Khorne Red. They are different kinds of paint: Citadel Khorne Red is an opaque base/layer paint and Green Stuff World Transparent Burgundy is an ink, glaze or transparent 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 11). Transparent Burgundy is cooler than Khorne Red. They are different kinds of paint.
The same difference applies the other way round: Khorne Red is 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 Khorne Red on the colour wheel See Transparent Burgundy on the colour wheel
All matches: Khorne Red equivalents · Transparent Burgundy equivalents