ΔE 22.3, loose: different enough that you should pick on purpose. Kakophoni Purple is a little lighter, more saturated, warmer than Purple People Eater.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Kakophoni Purple is a little lighter, more saturated, warmer than Purple People Eater.
The same difference applies the other way round: Purple People Eater is a little darker, more muted, cooler.
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 Purple People Eater on the colour wheel See Kakophoni Purple on the colour wheel
All matches: Purple People Eater equivalents · Kakophoni Purple equivalents