ΔE 9.8, close: similar, with a visible difference side by side. Celestial Blue is a little darker, more muted, warmer than Baharroth Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Celestial Blue is a little darker, more muted, warmer than Baharroth Blue.
The same difference applies the other way round: Baharroth Blue is a little lighter, more saturated, 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 Baharroth Blue on the colour wheel See Celestial Blue on the colour wheel
All matches: Baharroth Blue equivalents · Celestial Blue equivalents