Tidal Blue vs Air Superiority Blue

How close are they?

ΔE 16.3, loose: different enough that you should pick on purpose. Air Superiority Blue is more muted, warmer than Tidal Blue.

Can I use Air Superiority Blue instead of Tidal Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Air Superiority Blue is more muted, warmer than Tidal Blue.

Can I use Tidal Blue instead of Air Superiority Blue?

The same difference applies the other way round: Tidal Blue is 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.