ΔE 12.3, fair: the same colour family, but not a straight swap. Naggaroth Night is cooler than Deep Violet.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Naggaroth Night is cooler than Deep Violet.
The same difference applies the other way round: Deep Violet 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 Deep Violet on the colour wheel See Naggaroth Night on the colour wheel
All matches: Deep Violet equivalents · Naggaroth Night equivalents