ΔE 11.3, fair: the same colour family, but not a straight swap. Light Blue RLM76 is more muted, warmer than RLM 65 Light Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Light Blue RLM76 is more muted, warmer than RLM 65 Light Blue.
The same difference applies the other way round: RLM 65 Light Blue is more saturated, 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 65 Light Blue on the colour wheel See Light Blue RLM76 on the colour wheel
All matches: RLM 65 Light Blue equivalents · Light Blue RLM76 equivalents