ΔE 14.9, fair: the same colour family, but not a straight swap. Brutal Brown is noticeably darker, more muted than Viper Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Brutal Brown is noticeably darker, more muted than Viper Brown.
The same difference applies the other way round: Viper Brown is noticeably lighter, more saturated.
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 Viper Brown on the colour wheel See Brutal Brown on the colour wheel
All matches: Viper Brown equivalents · Brutal Brown equivalents