ΔE 7.1, close: similar, with a visible difference side by side. Olive Green is a little darker, cooler than RAL 6011 Resedagrün.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Olive Green is a little darker, cooler than RAL 6011 Resedagrün.
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.
See RAL 6011 Resedagrün on the colour wheel See Olive Green on the colour wheel
All matches: RAL 6011 Resedagrün equivalents · Olive Green equivalents