Viper Brown vs Satyr Brown

How close are they?

ΔE 8.5, close: similar, with a visible difference side by side. Satyr Brown is more saturated, warmer than Viper Brown.

Can I use Satyr Brown instead of Viper Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Satyr Brown is more saturated, warmer than Viper Brown.

Can I use Viper Brown instead of Satyr Brown?

The same difference applies the other way round: Viper Brown is 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.