ΔE 12.8, fair: the same colour family, but not a straight swap. Faded Red is a little lighter, more saturated, cooler than Ruddy Terra.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Faded Red is a little lighter, more saturated, cooler than Ruddy Terra.
The same difference applies the other way round: Ruddy Terra is a little darker, more muted, 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 Ruddy Terra on the colour wheel See Faded Red on the colour wheel
All matches: Ruddy Terra equivalents · Faded Red equivalents