ΔE 10.2, fair: the same colour family, but not a straight swap. Basalt Grey is more muted than King Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Basalt Grey is more muted than King Purple.
The same difference applies the other way round: King Purple is more saturated.
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 King Purple on the colour wheel See Basalt Grey on the colour wheel
All matches: King Purple equivalents · Basalt Grey equivalents