ΔE 10.6, fair: the same colour family, but not a straight swap. Steel Legion Drab is warmer than RLM 81 Version 2.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Steel Legion Drab is warmer than RLM 81 Version 2.
The same difference applies the other way round: RLM 81 Version 2 is 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 2 on the colour wheel See Steel Legion Drab on the colour wheel
All matches: RLM 81 Version 2 equivalents · Steel Legion Drab equivalents