ΔE 13.2, fair: the same colour family, but not a straight swap. Charred Brown is a little lighter, more muted, cooler than Dark Rust.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Charred Brown is a little lighter, more muted, cooler than Dark Rust.
The same difference applies the other way round: Dark Rust is a little darker, more saturated, 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 Dark Rust on the colour wheel See Charred Brown on the colour wheel
All matches: Dark Rust equivalents · Charred Brown equivalents