ΔE 23.4, loose: different enough that you should pick on purpose. Purple Black is noticeably lighter, more saturated than Matt Black.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Purple Black is noticeably lighter, more saturated than Matt Black.
The same difference applies the other way round: Matt 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 Matt Black on the colour wheel See Purple Black on the colour wheel
All matches: Matt Black equivalents · Purple Black equivalents