ΔE 7.3, close: similar, with a visible difference side by side. Lapislazuli is a little darker, warmer than Omega Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Lapislazuli is a little darker, warmer than Omega Blue.
The same difference applies the other way round: Omega Blue is a little lighter, cooler.
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 Omega Blue on the colour wheel See Lapislazuli on the colour wheel
All matches: Omega Blue equivalents · Lapislazuli equivalents