Thunderbird Blue vs Belladonna Green

How close are they?

ΔE 10.0, close: similar, with a visible difference side by side. Belladonna Green is a little darker, warmer than Thunderbird Blue.

Can I use Belladonna Green instead of Thunderbird Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Belladonna Green is a little darker, warmer than Thunderbird Blue.

Can I use Thunderbird Blue instead of Belladonna Green?

The same difference applies the other way round: Thunderbird Blue is a little lighter, 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.