ΔE 8.8, close: similar, with a visible difference side by side. RLM 75 Gray Violet is a little lighter, more muted than Mid Feldgrau.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). RLM 75 Gray Violet is a little lighter, more muted than Mid Feldgrau.
The same difference applies the other way round: Mid Feldgrau is a little darker, more saturated.
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 Mid Feldgrau on the colour wheel See RLM 75 Gray Violet on the colour wheel
All matches: Mid Feldgrau equivalents · RLM 75 Gray Violet equivalents