Enchanted Blue vs Deep Sky Blue

How close are they?

ΔE 18.5, loose: different enough that you should pick on purpose. Deep Sky Blue is a little lighter, much more muted, cooler than Enchanted Blue.

Can I use Deep Sky Blue instead of Enchanted Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Deep Sky Blue is a little lighter, much more muted, cooler than Enchanted Blue.

Can I use Enchanted Blue instead of Deep Sky Blue?

The same difference applies the other way round: Enchanted Blue is a little darker, much 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.