ΔE 10.3, fair: the same colour family, but not a straight swap. Signal Blue is cooler than Dioxazine Violet.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Signal Blue is cooler than Dioxazine Violet.
The same difference applies the other way round: Dioxazine 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 Dioxazine Violet on the colour wheel See Signal Blue on the colour wheel
All matches: Dioxazine Violet equivalents · Signal Blue equivalents