ΔE 10.9, fair: the same colour family, but not a straight swap. Steel Legion Drab is a little lighter, warmer than Slate No.34.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Steel Legion Drab is a little lighter, warmer than Slate No.34.
The same difference applies the other way round: Slate No.34 is a little darker, 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 Slate No.34 on the colour wheel See Steel Legion Drab on the colour wheel
All matches: Slate No.34 equivalents · Steel Legion Drab equivalents