ΔE 5.7, very close: most people won’t see a difference side by side. Flanker Blue is a little lighter, warmer than RLM 78 Light Blue.
Yes, for most jobs. Very close match (ΔE 6). Flanker Blue is a little lighter, warmer than RLM 78 Light Blue.
The same difference applies the other way round: RLM 78 Light Blue is a little darker, cooler.
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 78 Light Blue on the colour wheel See Flanker Blue on the colour wheel
All matches: RLM 78 Light Blue equivalents · Flanker Blue equivalents