ΔE 5.3, very close: most people won’t see a difference side by side. Dark Sea Blue is a little darker, warmer than Deep Ocean Blue.
Yes, for most jobs. Very close match (ΔE 5). Dark Sea Blue is a little darker, warmer than Deep Ocean Blue.
The same difference applies the other way round: Deep Ocean Blue is a little lighter, 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 Deep Ocean Blue on the colour wheel See Dark Sea Blue on the colour wheel
All matches: Deep Ocean Blue equivalents · Dark Sea Blue equivalents