ΔE 17.2, loose: different enough that you should pick on purpose. Purple Black is a little darker, much more muted than Mulled Berry.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Purple Black is a little darker, much more muted than Mulled Berry.
The same difference applies the other way round: Mulled Berry is a little lighter, much more saturated.
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 Mulled Berry on the colour wheel See Purple Black on the colour wheel
All matches: Mulled Berry equivalents · Purple Black equivalents