RAF Dark Sea Grey BS381C/638 vs Uniform Grey

How close are they?

ΔE 5.1, very close: most people won’t see a difference side by side. Uniform Grey is a little lighter than RAF Dark Sea Grey BS381C/638.

Can I use Uniform Grey instead of RAF Dark Sea Grey BS381C/638?

Yes, for most jobs. Very close match (ΔE 5). Uniform Grey is a little lighter than RAF Dark Sea Grey BS381C/638.

Can I use RAF Dark Sea Grey BS381C/638 instead of Uniform Grey?

The same difference applies the other way round: RAF Dark Sea Grey BS381C/638 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.