ΔE 19.6, loose: different enough that you should pick on purpose. Phoenician Purple is a little darker, much more saturated, cooler than Space Magenta.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Phoenician Purple is a little darker, much more saturated, cooler than Space Magenta.
The same difference applies the other way round: Space Magenta is a little lighter, much 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 Space Magenta on the colour wheel See Phoenician Purple on the colour wheel
All matches: Space Magenta equivalents · Phoenician Purple equivalents