ΔE 14.6, fair: the same colour family, but not a straight swap. Van Dyke Brown Hue is noticeably darker, more saturated than Steel Legion Drab.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Van Dyke Brown Hue is noticeably darker, more saturated than Steel Legion Drab.
The same difference applies the other way round: Steel Legion Drab is noticeably lighter, more muted.
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 Van Dyke Brown Hue on the colour wheel
All matches: Steel Legion Drab equivalents · Van Dyke Brown Hue equivalents