ΔE 9.8, close: similar, with a visible difference side by side. Raw Wool is a little lighter, more saturated, cooler than RLM 63.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Raw Wool is a little lighter, more saturated, cooler than RLM 63.
The same difference applies the other way round: RLM 63 is a little darker, 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 RLM 63 on the colour wheel See Raw Wool on the colour wheel
All matches: RLM 63 equivalents · Raw Wool equivalents