ΔE 16.3, loose: different enough that you should pick on purpose. Screamer Pink is more saturated, warmer than Octopus Purple.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Screamer Pink is more saturated, warmer than Octopus Purple.
The same difference applies the other way round: Octopus 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 Octopus Purple on the colour wheel See Screamer Pink on the colour wheel
All matches: Octopus Purple equivalents · Screamer Pink equivalents