Phoenician Purple vs Cobalt Violet Hue

How close are they?

ΔE 19.4, loose: different enough that you should pick on purpose. Cobalt Violet Hue is more saturated, warmer than Phoenician Purple.

Can I use Cobalt Violet Hue instead of Phoenician Purple?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Cobalt Violet Hue is more saturated, warmer than Phoenician Purple.

Can I use Phoenician Purple instead of Cobalt Violet Hue?

The same difference applies the other way round: Phoenician Purple 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.