ΔE 19.4, loose: different enough that you should pick on purpose. Ocean Gray is a little lighter, much more muted, warmer than Sea Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Ocean Gray is a little lighter, much more muted, warmer than Sea Blue.
The same difference applies the other way round: Sea Blue is a little darker, 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 Sea Blue on the colour wheel See Ocean Gray on the colour wheel
All matches: Sea Blue equivalents · Ocean Gray equivalents