Psychic Shock vs Tropical Turquoise

How close are they?

ΔE 7.4, close: similar, with a visible difference side by side. Tropical Turquoise is more saturated than Psychic Shock.

Can I use Tropical Turquoise instead of Psychic Shock?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Tropical Turquoise is more saturated than Psychic Shock.

Can I use Psychic Shock instead of Tropical Turquoise?

The same difference applies the other way round: Psychic Shock is more muted.

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.