ΔE 10.3, fair: the same colour family, but not a straight swap. Nocturnal Red is a little darker, more muted than Russet.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Nocturnal Red is a little darker, more muted than Russet.
The same difference applies the other way round: Russet is a little 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 Russet on the colour wheel See Nocturnal Red on the colour wheel
All matches: Russet equivalents · Nocturnal Red equivalents