ΔE 17.3, loose: different enough that you should pick on purpose. Olivegrove Green is noticeably darker, more saturated, cooler than Steel Legion Drab.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Olivegrove Green is noticeably darker, more saturated, cooler than Steel Legion Drab.
The same difference applies the other way round: Steel Legion Drab is noticeably lighter, more muted, 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 Steel Legion Drab on the colour wheel See Olivegrove Green on the colour wheel
All matches: Steel Legion Drab equivalents · Olivegrove Green equivalents