ΔE 4.3, very close: most people won’t see a difference side by side. US Olive Drab is a little darker, cooler than RLM 80.
Yes, for most jobs. Very close match (ΔE 4). US Olive Drab is a little darker, cooler than RLM 80.
The same difference applies the other way round: RLM 80 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 RLM 80 on the colour wheel See US Olive Drab on the colour wheel
All matches: RLM 80 equivalents · US Olive Drab equivalents