ΔE 10.7, fair: the same colour family, but not a straight swap. Brutal Brown is cooler than Catachan Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Brutal Brown is cooler than Catachan Flesh.
The same difference applies the other way round: Catachan Flesh 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 Catachan Flesh on the colour wheel See Brutal Brown on the colour wheel
All matches: Catachan Flesh equivalents · Brutal Brown equivalents