ΔE 10.1, fair: the same colour family, but not a straight swap. Brown Wash is a little darker, more muted than Sepia Tone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Brown Wash is a little darker, more muted than Sepia Tone.
The same difference applies the other way round: Sepia Tone 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 Sepia Tone on the colour wheel See Brown Wash on the colour wheel
All matches: Sepia Tone equivalents · Brown Wash equivalents