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