Screamer Pink vs Cobalt Violet Hue

How close are they?

ΔE 19.7, loose: different enough that you should pick on purpose. Cobalt Violet Hue is much more saturated, cooler than Screamer Pink.

Can I use Cobalt Violet Hue instead of Screamer Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Cobalt Violet Hue is much more saturated, cooler than Screamer Pink.

Can I use Screamer Pink instead of Cobalt Violet Hue?

The same difference applies the other way round: Screamer Pink is much 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.