ΔE 14.6, fair: the same colour family, but not a straight swap. Battle of Marathon is a little darker, much more muted, warmer than Tanned Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Battle of Marathon is a little darker, much more muted, warmer than Tanned Flesh.
The same difference applies the other way round: Tanned Flesh is a little lighter, much more saturated, cooler.
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 Tanned Flesh on the colour wheel See Battle of Marathon on the colour wheel
All matches: Tanned Flesh equivalents · Battle of Marathon equivalents