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