ΔE 17.3, loose: different enough that you should pick on purpose. Sunrise Blue is a little lighter, more saturated, cooler than RLM 76 Light Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Sunrise Blue is a little lighter, more saturated, cooler than RLM 76 Light Blue.
The same difference applies the other way round: RLM 76 Light Blue 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 76 Light Blue on the colour wheel See Sunrise Blue on the colour wheel
All matches: RLM 76 Light Blue equivalents · Sunrise Blue equivalents