Coven Purple vs Purple Rain

How close are they?

ΔE 15.5, loose: different enough that you should pick on purpose. Purple Rain is a little darker, more saturated, cooler than Coven Purple.

Can I use Purple Rain instead of Coven Purple?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Purple Rain is a little darker, more saturated, cooler than Coven Purple.

Can I use Coven Purple instead of Purple Rain?

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