ΔE 8.2, close: similar, with a visible difference side by side. Iron Wolf is a little lighter, cooler than RLM 83.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Iron Wolf is a little lighter, cooler than RLM 83.
The same difference applies the other way round: RLM 83 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 RLM 83 on the colour wheel See Iron Wolf on the colour wheel
All matches: RLM 83 equivalents · Iron Wolf equivalents