ΔE 14.9, fair: the same colour family, but not a straight swap. Deep Magenta is a little darker, more muted, warmer than Phantom Violet.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Deep Magenta is a little darker, more muted, warmer than Phantom Violet.
The same difference applies the other way round: Phantom Violet is a little lighter, more saturated, 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 Phantom Violet on the colour wheel See Deep Magenta on the colour wheel
All matches: Phantom Violet equivalents · Deep Magenta equivalents