ΔE 14.4, fair: the same colour family, but not a straight swap. Warlord Purple is a little darker, more saturated, warmer than Magnus the Red.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Warlord Purple is a little darker, more saturated, warmer than Magnus the Red.
The same difference applies the other way round: Magnus the Red is a little lighter, 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 Magnus the Red on the colour wheel See Warlord Purple on the colour wheel
All matches: Magnus the Red equivalents · Warlord Purple equivalents