ΔE 7.9, close: similar, with a visible difference side by side. RLM 76 Light Blue is a little lighter than Ulthuan Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). RLM 76 Light Blue is a little lighter than Ulthuan Grey.
The same difference applies the other way round: Ulthuan Grey is a little darker.
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 Ulthuan Grey on the colour wheel See RLM 76 Light Blue on the colour wheel
All matches: Ulthuan Grey equivalents · RLM 76 Light Blue equivalents