ΔE 8.6, close: similar, with a visible difference side by side. Russian AF Blue is more muted, cooler than Lothern Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Russian AF Blue is more muted, cooler than Lothern Blue.
The same difference applies the other way round: Lothern Blue is more saturated, 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 Lothern Blue on the colour wheel See Russian AF Blue on the colour wheel
All matches: Lothern Blue equivalents · Russian AF Blue equivalents