ΔE 10.9, fair: the same colour family, but not a straight swap. Dry Rust Brown is more saturated, warmer than Ruddy Terra.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Dry Rust Brown is more saturated, warmer than Ruddy Terra.
The same difference applies the other way round: Ruddy Terra is more muted, 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 Ruddy Terra on the colour wheel See Dry Rust Brown on the colour wheel
All matches: Ruddy Terra equivalents · Dry Rust Brown equivalents