ΔE 13.7, fair: the same colour family, but not a straight swap. Red Oxide is noticeably lighter, more saturated, warmer than Beret Maroon.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Red Oxide is noticeably lighter, more saturated, warmer than Beret Maroon.
The same difference applies the other way round: Beret Maroon is noticeably darker, 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 Beret Maroon on the colour wheel See Red Oxide on the colour wheel
All matches: Beret Maroon equivalents · Red Oxide equivalents