Nighthaunt Gloom vs Cool Blue

How close are they?

ΔE 16.9, loose: different enough that you should pick on purpose. Cool Blue is a little darker, warmer than Nighthaunt Gloom.

Can I use Cool Blue instead of Nighthaunt Gloom?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Cool Blue is a little darker, warmer than Nighthaunt Gloom.

Can I use Nighthaunt Gloom instead of Cool Blue?

The same difference applies the other way round: Nighthaunt Gloom is a little lighter, 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.