ΔE 16.3, loose: different enough that you should pick on purpose. Calgar Blue is a little lighter, more saturated, cooler than Purple People Eater.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Calgar Blue is a little lighter, more saturated, cooler than Purple People Eater.
The same difference applies the other way round: Purple People Eater is a little darker, more muted, warmer.
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 Calgar Blue on the colour wheel
All matches: Purple People Eater equivalents · Calgar Blue equivalents