ΔE 8.6, close: similar, with a visible difference side by side. Steel Legion Drab is a little lighter, cooler than RAL 7017 Dunkelbraun.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Steel Legion Drab is a little lighter, cooler than RAL 7017 Dunkelbraun.
The same difference applies the other way round: RAL 7017 Dunkelbraun is a little darker, 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 RAL 7017 Dunkelbraun on the colour wheel See Steel Legion Drab on the colour wheel
All matches: RAL 7017 Dunkelbraun equivalents · Steel Legion Drab equivalents