ΔE 6.4, close: similar, with a visible difference side by side. Flanker Blue is more muted, cooler than RLM 65 Light Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Flanker Blue is more muted, cooler than RLM 65 Light Blue.
The same difference applies the other way round: RLM 65 Light Blue is more saturated, 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 Light Blue on the colour wheel See Flanker Blue on the colour wheel
All matches: RLM 65 Light Blue equivalents · Flanker Blue equivalents