Caribbean Ocean vs Cobalt Turquoise

How close are they?

ΔE 18.6, loose: different enough that you should pick on purpose. Cobalt Turquoise is noticeably darker, more muted, warmer than Caribbean Ocean. They are different kinds of paint: Army Painter Caribbean Ocean is a one-coat contrast-style paint and Golden Cobalt Turquoise is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.

Can I use Cobalt Turquoise instead of Caribbean Ocean?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Cobalt Turquoise is noticeably darker, more muted, warmer than Caribbean Ocean. They are different kinds of paint.

Can I use Caribbean Ocean instead of Cobalt Turquoise?

The same difference applies the other way round: Caribbean Ocean is noticeably lighter, 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.