ΔE 7.4, close: similar, with a visible difference side by side. IJN Medium Grey is more saturated than Administratum Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). IJN Medium Grey is more saturated than Administratum Grey.
The same difference applies the other way round: Administratum Grey is more muted.
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 Administratum Grey on the colour wheel See IJN Medium Grey on the colour wheel
All matches: Administratum Grey equivalents · IJN Medium Grey equivalents