ΔE 11.9, fair: the same colour family, but not a straight swap. Flesh Rose is a little lighter, more saturated, cooler than Viper Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Flesh Rose is a little lighter, more saturated, cooler than Viper Brown.
The same difference applies the other way round: Viper Brown is a little darker, 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 Viper Brown on the colour wheel See Flesh Rose on the colour wheel
All matches: Viper Brown equivalents · Flesh Rose equivalents