ΔE 8.5, close: similar, with a visible difference side by side. Intermediate Blue is more muted than German Gray.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Intermediate Blue is more muted than German Gray.
The same difference applies the other way round: German Gray is more saturated.
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 German Gray on the colour wheel See Intermediate Blue on the colour wheel
All matches: German Gray equivalents · Intermediate Blue equivalents