ΔE 21.5, loose: different enough that you should pick on purpose. Light Sea Blue is more saturated, cooler than Teal.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Light Sea Blue is more saturated, cooler than Teal.
The same difference applies the other way round: Teal is more muted, warmer.
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 Teal on the colour wheel See Light Sea Blue on the colour wheel
All matches: Teal equivalents · Light Sea Blue equivalents