ΔE 13.3, fair: the same colour family, but not a straight swap. Warlord Purple is a little lighter, more saturated, cooler than Rebel Red.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Warlord Purple is a little lighter, more saturated, cooler than Rebel Red.
The same difference applies the other way round: Rebel Red 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 Rebel Red on the colour wheel See Warlord Purple on the colour wheel
All matches: Rebel Red equivalents · Warlord Purple equivalents