ΔE 31.6, loose: different enough that you should pick on purpose. Grey Spell is a little darker, much more muted, warmer than Caribbean Ocean.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 32). Grey Spell is a little darker, much more muted, warmer than Caribbean Ocean.
The same difference applies the other way round: Caribbean Ocean is a little lighter, much 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 Caribbean Ocean on the colour wheel See Grey Spell on the colour wheel
All matches: Caribbean Ocean equivalents · Grey Spell equivalents