ΔE 8.0, close: similar, with a visible difference side by side. Celestra Grey is cooler than RLM 65 (1938).
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Celestra Grey is cooler than RLM 65 (1938).
The same difference applies the other way round: RLM 65 (1938) is 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 65 (1938) on the colour wheel See Celestra Grey on the colour wheel
All matches: RLM 65 (1938) equivalents · Celestra Grey equivalents