ΔE 17.1, loose: different enough that you should pick on purpose. Dark Rose is more saturated, cooler than Steel Legion Drab.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Dark Rose is more saturated, cooler than Steel Legion Drab.
The same difference applies the other way round: Steel Legion Drab is 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 Dark Rose on the colour wheel
All matches: Steel Legion Drab equivalents · Dark Rose equivalents