ΔE 10.9, fair: the same colour family, but not a straight swap. Engine Gray is cooler than King Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Engine Gray is cooler than King Purple.
The same difference applies the other way round: King Purple is 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 King Purple on the colour wheel See Engine Gray on the colour wheel
All matches: King Purple equivalents · Engine Gray equivalents