ΔE 20.2, loose: different enough that you should pick on purpose. Quicksand Brown is more saturated, warmer than Ruddy Terra.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Quicksand 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 Quicksand Brown on the colour wheel
All matches: Ruddy Terra equivalents · Quicksand Brown equivalents