ΔE 12.5, fair: the same colour family, but not a straight swap. Xereus Purple is a little darker, warmer than Alien Purple.
✓ Herrick Games paint comparison chart lists these two as equivalents.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Xereus Purple is a little darker, warmer than Alien Purple.
The same difference applies the other way round: Alien Purple is a little lighter, 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 Alien Purple on the colour wheel See Xereus Purple on the colour wheel
All matches: Alien Purple equivalents · Xereus Purple equivalents