Bright Yellow Green vs Goblin Green

How close are they?

ΔE 10.0, close: similar, with a visible difference side by side. Goblin Green is a little darker, more muted than Bright Yellow Green.

Can I use Goblin Green instead of Bright Yellow Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Goblin Green is a little darker, more muted than Bright Yellow Green.

Can I use Bright Yellow Green instead of Goblin Green?

The same difference applies the other way round: Bright Yellow Green is a little lighter, more saturated.

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.