Alpha Blue vs Mediterranean Blue

How close are they?

ΔE 15.9, loose: different enough that you should pick on purpose. Mediterranean Blue is a little darker, more saturated, cooler than Alpha Blue.

Can I use Mediterranean Blue instead of Alpha Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Mediterranean Blue is a little darker, more saturated, cooler than Alpha Blue.

Can I use Alpha Blue instead of Mediterranean Blue?

The same difference applies the other way round: Alpha Blue is a little lighter, 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.