Deep Purple vs Diabolic Plum

How close are they?

ΔE 11.3, fair: the same colour family, but not a straight swap. Diabolic Plum is noticeably darker than Deep Purple.

Can I use Diabolic Plum instead of Deep Purple?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Diabolic Plum is noticeably darker than Deep Purple.

Can I use Deep Purple instead of Diabolic Plum?

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

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.