Coven Purple vs Phantom Violet

How close are they?

ΔE 21.4, loose: different enough that you should pick on purpose. Phantom Violet is noticeably darker, more saturated, warmer than Coven Purple.

Can I use Phantom Violet instead of Coven Purple?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Phantom Violet is noticeably darker, more saturated, warmer than Coven Purple.

Can I use Coven Purple instead of Phantom Violet?

The same difference applies the other way round: Coven Purple is noticeably lighter, more muted, cooler.

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.