ΔE 25.0, loose: different enough that you should pick on purpose. Quinacridone Magenta is more saturated, warmer than Kakophoni Purple.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Quinacridone Magenta is more saturated, warmer than Kakophoni Purple.
The same difference applies the other way round: Kakophoni Purple is 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 Kakophoni Purple on the colour wheel See Quinacridone Magenta on the colour wheel
All matches: Kakophoni Purple equivalents · Quinacridone Magenta equivalents