ΔE 10.9, fair: the same colour family, but not a straight swap. RLM 78 Light Blue is a little lighter, cooler than Runic Cobalt.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). RLM 78 Light Blue is a little lighter, cooler than Runic Cobalt.
The same difference applies the other way round: Runic Cobalt is a little darker, 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 Runic Cobalt on the colour wheel See RLM 78 Light Blue on the colour wheel
All matches: Runic Cobalt equivalents · RLM 78 Light Blue equivalents