Hexed Violet vs Violet Skies

How close are they?

ΔE 15.9, loose: different enough that you should pick on purpose. Violet Skies is more saturated, warmer than Hexed Violet.

Can I use Violet Skies instead of Hexed Violet?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Violet Skies is more saturated, warmer than Hexed Violet.

Can I use Hexed Violet instead of Violet Skies?

The same difference applies the other way round: Hexed Violet is 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.