ΔE 11.1, fair: the same colour family, but not a straight swap. Demon Brown is a little darker, more saturated, cooler than Cygor Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Demon Brown is a little darker, more saturated, cooler than Cygor Brown.
The same difference applies the other way round: Cygor Brown is a little lighter, 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 Cygor Brown on the colour wheel See Demon Brown on the colour wheel
All matches: Cygor Brown equivalents · Demon Brown equivalents