ΔE 10.4, fair: the same colour family, but not a straight swap. Marine Mist is a little lighter, more muted, warmer than Sky Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Marine Mist is a little lighter, more muted, warmer than Sky Blue.
The same difference applies the other way round: Sky Blue is a little darker, more saturated, 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 Marine Mist on the colour wheel
All matches: Sky Blue equivalents · Marine Mist equivalents