ΔE 7.6, close: similar, with a visible difference side by side. Temple Gate Teal is a little darker, more muted, cooler than Seawater.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Temple Gate Teal is a little darker, more muted, cooler than Seawater.
The same difference applies the other way round: Seawater is a little lighter, more saturated, 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 Seawater on the colour wheel See Temple Gate Teal on the colour wheel
All matches: Seawater equivalents · Temple Gate Teal equivalents