ΔE 19.0, loose: different enough that you should pick on purpose. Azure is noticeably darker, warmer than Sky Blue.
✓ Herrick Games paint comparison chart lists these two as equivalents.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Azure is noticeably darker, warmer than Sky Blue.
The same difference applies the other way round: Sky Blue is noticeably lighter, 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 Sky Blue on the colour wheel See Azure on the colour wheel
All matches: Sky Blue equivalents · Azure equivalents