ΔE 24.3, loose: different enough that you should pick on purpose. Tan is noticeably lighter, warmer than Red Oxide.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Tan is noticeably lighter, warmer than Red Oxide.
The same difference applies the other way round: Red Oxide is noticeably darker, 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 Red Oxide on the colour wheel See Tan on the colour wheel
All matches: Red Oxide equivalents · Tan equivalents