ΔE 9.2, close: similar, with a visible difference side by side. Emperor's Children is a little darker, more saturated, warmer than Fey Pink.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Emperor's Children is a little darker, more saturated, warmer than Fey Pink.
The same difference applies the other way round: Fey Pink is a little lighter, more muted, 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 Fey Pink on the colour wheel See Emperor's Children on the colour wheel
All matches: Fey Pink equivalents · Emperor's Children equivalents