Gladeshard vs Nature Green

How close are they?

ΔE 9.8, close: similar, with a visible difference side by side. Nature Green is a little darker than Gladeshard.

Can I use Nature Green instead of Gladeshard?

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

Can I use Gladeshard instead of Nature Green?

The same difference applies the other way round: Gladeshard 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.