RAL 6011 Resedagrün vs Intermediate Green

How close are they?

ΔE 8.5, close: similar, with a visible difference side by side. Intermediate Green is a little darker, cooler than RAL 6011 Resedagrün.

Can I use Intermediate Green instead of RAL 6011 Resedagrün?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Intermediate Green is a little darker, cooler than RAL 6011 Resedagrün.

Can I use RAL 6011 Resedagrün instead of Intermediate Green?

The same difference applies the other way round: RAL 6011 Resedagrün is a little lighter, 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.