ΔE 31.5, loose: different enough that you should pick on purpose. Warlord Purple is a little lighter, more saturated, cooler than Red Oxide.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 32). Warlord Purple is a little lighter, more saturated, cooler than Red Oxide.
The same difference applies the other way round: Red Oxide is a little darker, more muted, 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 Red Oxide on the colour wheel See Warlord Purple on the colour wheel
All matches: Red Oxide equivalents · Warlord Purple equivalents