ΔE 12.4, fair: the same colour family, but not a straight swap. Dioxazine Violet is a little darker, more saturated than Naggaroth Night.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Dioxazine Violet is a little darker, more saturated than Naggaroth Night.
The same difference applies the other way round: Naggaroth Night is a little lighter, more muted.
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 Naggaroth Night on the colour wheel See Dioxazine Violet on the colour wheel
All matches: Naggaroth Night equivalents · Dioxazine Violet equivalents