ΔE 6.9, close: similar, with a visible difference side by side. Medium Seagray BS637 is a little lighter than Uniform Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Medium Seagray BS637 is a little lighter than Uniform Grey.
The same difference applies the other way round: Uniform Grey is a little darker.
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 Medium Seagray BS637 on the colour wheel
All matches: Uniform Grey equivalents · Medium Seagray BS637 equivalents