ΔE 11.1, fair: the same colour family, but not a straight swap. Blueberry is a little lighter, more saturated than Cultist Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Blueberry is a little lighter, more saturated than Cultist Purple.
The same difference applies the other way round: Cultist Purple is a little darker, more muted.
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 Cultist Purple on the colour wheel See Blueberry on the colour wheel
All matches: Cultist Purple equivalents · Blueberry equivalents