ΔE 16.6, loose: different enough that you should pick on purpose. Violet is a little darker, warmer than Dark Feldgrau.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Violet is a little darker, warmer than Dark Feldgrau.
The same difference applies the other way round: Dark Feldgrau is a little lighter, 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 Dark Feldgrau on the colour wheel See Violet on the colour wheel
All matches: Dark Feldgrau equivalents · Violet equivalents