ΔE 18.5, loose: different enough that you should pick on purpose. Wicked Purple is noticeably lighter, more saturated than Deep Black.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Wicked Purple is noticeably lighter, more saturated than Deep Black.
The same difference applies the other way round: Deep Black is noticeably darker, more muted.
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.
See Deep Black on the colour wheel See Wicked Purple on the colour wheel
All matches: Deep Black equivalents · Wicked Purple equivalents