Elemental Bolt vs Caribbean Blue

How close are they?

ΔE 19.3, loose: different enough that you should pick on purpose. Caribbean Blue is noticeably lighter, cooler than Elemental Bolt.

Can I use Caribbean Blue instead of Elemental Bolt?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Caribbean Blue is noticeably lighter, cooler than Elemental Bolt.

Can I use Elemental Bolt instead of Caribbean Blue?

The same difference applies the other way round: Elemental Bolt is noticeably darker, 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.