ΔE 13.3, fair: the same colour family, but not a straight swap. RLM 78 Light Blue is a little darker, cooler than Etherium Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). RLM 78 Light Blue is a little darker, cooler than Etherium Blue.
The same difference applies the other way round: Etherium Blue is a little lighter, 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 Etherium Blue on the colour wheel See RLM 78 Light Blue on the colour wheel
All matches: Etherium Blue equivalents · RLM 78 Light Blue equivalents