Hazardous Smog vs Surfer Orc Flesh

How close are they?

ΔE 8.9, close: similar, with a visible difference side by side. Surfer Orc Flesh is a little darker than Hazardous Smog.

Can I use Surfer Orc Flesh instead of Hazardous Smog?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Surfer Orc Flesh is a little darker than Hazardous Smog.

Can I use Hazardous Smog instead of Surfer Orc Flesh?

The same difference applies the other way round: Hazardous Smog is a little lighter.

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.