Thunderhawk Blue vs Oxidation Green

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Oxidation Green is more muted, cooler than Thunderhawk Blue.

Can I use Oxidation Green instead of Thunderhawk Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Oxidation Green is more muted, cooler than Thunderhawk Blue.

Can I use Thunderhawk Blue instead of Oxidation Green?

The same difference applies the other way round: Thunderhawk Blue is more saturated, 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.