ΔE 19.9, loose: different enough that you should pick on purpose. Bestial Brown is noticeably darker, warmer than Ruddy Terra.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Bestial Brown is noticeably darker, warmer than Ruddy Terra.
The same difference applies the other way round: Ruddy Terra is noticeably lighter, 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 Bestial Brown on the colour wheel
All matches: Ruddy Terra equivalents · Bestial Brown equivalents