Dusk Red vs Red Cloak

How close are they?

ΔE 21.6, loose: different enough that you should pick on purpose. Red Cloak is much more saturated, warmer than Dusk Red.

Can I use Red Cloak instead of Dusk Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Red Cloak is much more saturated, warmer than Dusk Red.

Can I use Dusk Red instead of Red Cloak?

The same difference applies the other way round: Dusk Red is much 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.