ΔE 16.1, loose: different enough that you should pick on purpose. Steel Legion Drab is noticeably lighter, more muted, warmer than RAL 6003 Olivgrün opt.2.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Steel Legion Drab is noticeably lighter, more muted, warmer than RAL 6003 Olivgrün opt.2.
The same difference applies the other way round: RAL 6003 Olivgrün opt.2 is noticeably darker, more saturated, 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 RAL 6003 Olivgrün opt.2 on the colour wheel See Steel Legion Drab on the colour wheel
All matches: RAL 6003 Olivgrün opt.2 equivalents · Steel Legion Drab equivalents