ΔE 9.9, close: similar, with a visible difference side by side. Rainy Grey is a little lighter, more muted than Uniform Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Rainy Grey is a little lighter, more muted than Uniform Grey.
The same difference applies the other way round: Uniform Grey is a little darker, 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 Uniform Grey on the colour wheel See Rainy Grey on the colour wheel
All matches: Uniform Grey equivalents · Rainy Grey equivalents