ΔE 9.9, close: similar, with a visible difference side by side. Dioxazine Purple is a little darker, more muted than Purple Tone. They are different kinds of paint: Army Painter Purple Tone 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.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Dioxazine Purple is a little darker, more muted than Purple Tone. They are different kinds of paint.
The same difference applies the other way round: Purple Tone is a little lighter, more saturated.
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 Purple Tone on the colour wheel See Dioxazine Purple on the colour wheel
All matches: Purple Tone equivalents · Dioxazine Purple equivalents