Joridyn Turquoise vs Andrea Blue

How close are they?

ΔE 15.4, loose: different enough that you should pick on purpose. Andrea Blue is a little darker, more saturated, warmer than Joridyn Turquoise.

Can I use Andrea Blue instead of Joridyn Turquoise?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Andrea Blue is a little darker, more saturated, warmer than Joridyn Turquoise.

Can I use Joridyn Turquoise instead of Andrea Blue?

The same difference applies the other way round: Joridyn Turquoise is a little lighter, more muted, 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.