Eidolon Purple Clear vs Dioxazine Violet

How close are they?

ΔE 26.0, loose: different enough that you should pick on purpose. Dioxazine Violet is noticeably darker, much more muted than Eidolon Purple Clear.

Can I use Dioxazine Violet instead of Eidolon Purple Clear?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Dioxazine Violet is noticeably darker, much more muted than Eidolon Purple Clear.

Can I use Eidolon Purple Clear instead of Dioxazine Violet?

The same difference applies the other way round: Eidolon Purple Clear is noticeably lighter, much 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.