Coven Purple vs Violet

How close are they?

ΔE 17.8, loose: different enough that you should pick on purpose. Violet is noticeably darker, more muted than Coven Purple.

Can I use Violet instead of Coven Purple?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Violet is noticeably darker, more muted than Coven Purple.

Can I use Coven Purple instead of Violet?

The same difference applies the other way round: Coven Purple is noticeably 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.