Cloudburst Blue vs Dark Kraken

How close are they?

ΔE 21.4, loose: different enough that you should pick on purpose. Dark Kraken is a little darker, more muted, cooler than Cloudburst Blue.

Can I use Dark Kraken instead of Cloudburst Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Dark Kraken is a little darker, more muted, cooler than Cloudburst Blue.

Can I use Cloudburst Blue instead of Dark Kraken?

The same difference applies the other way round: Cloudburst Blue is a little lighter, more saturated, 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.