ΔE 11.9, fair: the same colour family, but not a straight swap. Plum is a little lighter, more muted, warmer than Kakophoni Purple.
✓ Herrick Games paint comparison chart lists these two as equivalents.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Plum is a little lighter, more muted, warmer than Kakophoni Purple.
The same difference applies the other way round: Kakophoni Purple is a little darker, more saturated, 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 Plum on the colour wheel
All matches: Kakophoni Purple equivalents · Plum equivalents