ΔE 8.3, close: similar, with a visible difference side by side. Steel Legion Drab is a little darker, warmer than RLM 81 Version 1.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Steel Legion Drab is a little darker, warmer than RLM 81 Version 1.
The same difference applies the other way round: RLM 81 Version 1 is a little lighter, cooler.
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 81 Version 1 on the colour wheel See Steel Legion Drab on the colour wheel
All matches: RLM 81 Version 1 equivalents · Steel Legion Drab equivalents