ΔE 17.7, loose: different enough that you should pick on purpose. Intermediate Blue is much more muted, warmer than Sea Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Intermediate Blue is much more muted, warmer than Sea Blue.
The same difference applies the other way round: Sea Blue is 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 Intermediate Blue on the colour wheel
All matches: Sea Blue equivalents · Intermediate Blue equivalents