Blood Chalice vs Cloud Pink

How close are they?

ΔE 18.7, loose: different enough that you should pick on purpose. Cloud Pink is more muted, cooler than Blood Chalice.

Can I use Cloud Pink instead of Blood Chalice?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Cloud Pink is more muted, cooler than Blood Chalice.

Can I use Blood Chalice instead of Cloud Pink?

The same difference applies the other way round: Blood Chalice is more saturated, 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.