ΔE 13.2, fair: the same colour family, but not a straight swap. Emperor's Children is a little lighter, cooler than Moonpetal.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Emperor's Children is a little lighter, cooler than Moonpetal.
The same difference applies the other way round: Moonpetal is a little darker, 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 Emperor's Children on the colour wheel
All matches: Moonpetal equivalents · Emperor's Children equivalents