ΔE 12.9, fair: the same colour family, but not a straight swap. Exile Blue is a little darker, more muted, cooler than Hive Dweller Purple. They are different kinds of paint: Army Painter Hive Dweller Purple is a one-coat contrast-style paint and Formula P3 Exile Blue is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Exile Blue is a little darker, more muted, cooler than Hive Dweller Purple. They are different kinds of paint.
The same difference applies the other way round: Hive Dweller Purple is a little lighter, more saturated, 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 Hive Dweller Purple on the colour wheel See Exile Blue on the colour wheel
All matches: Hive Dweller Purple equivalents · Exile Blue equivalents