ΔE 12.9, fair: the same colour family, but not a straight swap. Dark Red is a little lighter, more muted, cooler than Redwood Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Dark Red is a little lighter, more muted, cooler than Redwood Brown.
The same difference applies the other way round: Redwood Brown is a little darker, more saturated, 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 Redwood Brown on the colour wheel See Dark Red on the colour wheel
All matches: Redwood Brown equivalents · Dark Red equivalents