Dark Nude Pink vs Emperor's Children

How close are they?

ΔE 15.5, loose: different enough that you should pick on purpose. Emperor's Children is a little lighter, more saturated, cooler than Dark Nude Pink.

Can I use Emperor's Children instead of Dark Nude Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Emperor's Children is a little lighter, more saturated, cooler than Dark Nude Pink.

Can I use Dark Nude Pink instead of Emperor's Children?

The same difference applies the other way round: Dark Nude Pink is a little darker, 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.