ΔE 10.8, fair: the same colour family, but not a straight swap. AMT-11 Blue 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 11). AMT-11 Blue 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 AMT-11 Blue Grey on the colour wheel
All matches: King Purple equivalents · AMT-11 Blue Grey equivalents