ΔE 22.8, loose: different enough that you should pick on purpose. Crimson Magenta is a little darker, much more saturated, warmer than Purple Quasar.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Crimson Magenta is a little darker, much more saturated, warmer than Purple Quasar.
The same difference applies the other way round: Purple Quasar is a little lighter, much 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 Quasar on the colour wheel See Crimson Magenta on the colour wheel
All matches: Purple Quasar equivalents · Crimson Magenta equivalents