RAL 6011 Resedagrün vs Pale Green

How close are they?

ΔE 9.6, close: similar, with a visible difference side by side. Pale Green is a little lighter, more saturated, cooler than RAL 6011 Resedagrün.

Can I use Pale Green instead of RAL 6011 Resedagrün?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Pale Green is a little lighter, more saturated, cooler than RAL 6011 Resedagrün.

Can I use RAL 6011 Resedagrün instead of Pale Green?

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