Psychic Shock vs Surfer Orc Flesh

How close are they?

ΔE 9.3, close: similar, with a visible difference side by side. Surfer Orc Flesh is a little darker, more saturated, warmer than Psychic Shock.

Can I use Surfer Orc Flesh instead of Psychic Shock?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Surfer Orc Flesh is a little darker, more saturated, warmer than Psychic Shock.

Can I use Psychic Shock instead of Surfer Orc Flesh?

The same difference applies the other way round: Psychic Shock is a little lighter, more muted, 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.