ΔE 11.3, fair: the same colour family, but not a straight swap. Pale Blue is a little lighter, more muted, cooler than Morning Sky.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Pale Blue is a little lighter, more muted, cooler than Morning Sky.
The same difference applies the other way round: Morning Sky is a little darker, 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.
See Morning Sky on the colour wheel See Pale Blue on the colour wheel
All matches: Morning Sky equivalents · Pale Blue equivalents