ΔE 9.6, close: similar, with a visible difference side by side. Dark Slate Grey is cooler than Steel Legion Drab.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Dark Slate Grey is cooler than Steel Legion Drab.
The same difference applies the other way round: Steel Legion Drab is 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 Dark Slate Grey on the colour wheel
All matches: Steel Legion Drab equivalents · Dark Slate Grey equivalents