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