ΔE 20.5, loose: different enough that you should pick on purpose. Sky Blue is noticeably lighter, cooler than Morning Sky.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Sky Blue is noticeably lighter, cooler than Morning Sky.
The same difference applies the other way round: Morning Sky is noticeably 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 Morning Sky on the colour wheel See Sky Blue on the colour wheel
All matches: Morning Sky equivalents · Sky Blue equivalents