RAF Extra Dark Sea Grey BS381C/640 vs Engine Gray

How close are they?

ΔE 4.8, very close: most people won’t see a difference side by side. Engine Gray is more saturated than RAF Extra Dark Sea Grey BS381C/640.

Can I use Engine Gray instead of RAF Extra Dark Sea Grey BS381C/640?

Yes, for most jobs. Very close match (ΔE 5). Engine Gray is more saturated than RAF Extra Dark Sea Grey BS381C/640.

Can I use RAF Extra Dark Sea Grey BS381C/640 instead of Engine Gray?

The same difference applies the other way round: RAF Extra Dark Sea Grey BS381C/640 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.