ΔE 10.6, fair: the same colour family, but not a straight swap. Magenta is a little lighter, more saturated than Pink Horror.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Magenta is a little lighter, more saturated than Pink Horror.
The same difference applies the other way round: Pink Horror is a little darker, more muted.
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 Pink Horror on the colour wheel See Magenta on the colour wheel
All matches: Pink Horror equivalents · Magenta equivalents