Omega Blue vs Hydra Turquoise

How close are they?

ΔE 17.0, loose: different enough that you should pick on purpose. Hydra Turquoise is noticeably lighter, more muted, cooler than Omega Blue.

Can I use Hydra Turquoise instead of Omega Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Hydra Turquoise is noticeably lighter, more muted, cooler than Omega Blue.

Can I use Omega Blue instead of Hydra Turquoise?

The same difference applies the other way round: Omega Blue is noticeably darker, 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.