ΔE 15.4, loose: different enough that you should pick on purpose. Off-White is a little lighter, much more muted than Cloudy Sky.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Off-White is a little lighter, much more muted than Cloudy Sky.
The same difference applies the other way round: Cloudy Sky is a little darker, much more saturated.
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 Cloudy Sky on the colour wheel See Off-White on the colour wheel
All matches: Cloudy Sky equivalents · Off-White equivalents