RLM 78 (1942) vs Light Blue RLM78

How close are they?

ΔE 6.3, close: similar, with a visible difference side by side. Light Blue RLM78 is a little darker, cooler than RLM 78 (1942).

✓ AK 3rd Generation equivalence chart lists these two as equivalents.

Can I use Light Blue RLM78 instead of RLM 78 (1942)?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Light Blue RLM78 is a little darker, cooler than RLM 78 (1942).

Can I use RLM 78 (1942) instead of Light Blue RLM78?

The same difference applies the other way round: RLM 78 (1942) 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.