ΔE 11.9, fair: the same colour family, but not a straight swap. Eye of Terror is a little darker, more saturated, cooler than Moonpetal.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Eye of Terror is a little darker, more saturated, cooler than Moonpetal.
The same difference applies the other way round: Moonpetal is a little lighter, 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 Moonpetal on the colour wheel See Eye of Terror on the colour wheel
All matches: Moonpetal equivalents · Eye of Terror equivalents