ΔE 29.1, loose: different enough that you should pick on purpose. Murderous Magenta is a little lighter, much more saturated, warmer than Phoenician Purple.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Murderous Magenta is a little lighter, much more saturated, warmer than Phoenician Purple.
The same difference applies the other way round: Phoenician Purple is a little darker, 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 Phoenician Purple on the colour wheel See Murderous Magenta on the colour wheel
All matches: Phoenician Purple equivalents · Murderous Magenta equivalents