ΔE 16.9, loose: different enough that you should pick on purpose. Dioxazine Purple is noticeably darker, cooler than Druchii Violet. They are different kinds of paint: Citadel Druchii Violet is a wash/shade and Golden Dioxazine Purple is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Dioxazine Purple is noticeably darker, cooler than Druchii Violet. They are different kinds of paint.
The same difference applies the other way round: Druchii Violet is noticeably lighter, 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 Druchii Violet on the colour wheel See Dioxazine Purple on the colour wheel
All matches: Druchii Violet equivalents · Dioxazine Purple equivalents