Fallen Grass vs Intermediate Green

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Intermediate Green is a little darker than Fallen Grass.

Can I use Intermediate Green instead of Fallen Grass?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Intermediate Green is a little darker than Fallen Grass.

Can I use Fallen Grass instead of Intermediate Green?

The same difference applies the other way round: Fallen Grass 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.