ΔE 13.0, fair: the same colour family, but not a straight swap. Pale Brown is noticeably lighter, more muted than Battle of Marathon.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Pale Brown is noticeably lighter, more muted than Battle of Marathon.
The same difference applies the other way round: Battle of Marathon is noticeably darker, 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 Battle of Marathon on the colour wheel See Pale Brown on the colour wheel
All matches: Battle of Marathon equivalents · Pale Brown equivalents