ΔE 17.0, loose: different enough that you should pick on purpose. Dark Rose Tan is noticeably lighter, cooler than Ruddy Terra.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Dark Rose Tan is noticeably lighter, cooler than Ruddy Terra.
The same difference applies the other way round: Ruddy Terra is noticeably darker, 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 Dark Rose Tan on the colour wheel
All matches: Ruddy Terra equivalents · Dark Rose Tan equivalents