ΔE 8.4, close: similar, with a visible difference side by side. Light Rust is more saturated than Battle of Marathon.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Light Rust is more saturated than Battle of Marathon.
The same difference applies the other way round: Battle of Marathon is more muted.
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 Light Rust on the colour wheel
All matches: Battle of Marathon equivalents · Light Rust equivalents