ΔE 15.2, loose: different enough that you should pick on purpose. Light Brown is noticeably lighter, more muted, warmer than Red Oxide.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Light Brown is noticeably lighter, more muted, warmer than Red Oxide.
The same difference applies the other way round: Red Oxide is noticeably darker, more saturated, 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 Light Brown on the colour wheel
All matches: Red Oxide equivalents · Light Brown equivalents