Elemental Bolt vs Tropical Turquoise

How close are they?

ΔE 16.9, loose: different enough that you should pick on purpose. Tropical Turquoise is noticeably lighter, cooler than Elemental Bolt.

Can I use Tropical Turquoise instead of Elemental Bolt?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Tropical Turquoise is noticeably lighter, cooler than Elemental Bolt.

Can I use Elemental Bolt instead of Tropical Turquoise?

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.