RAF Extra Dark Sea Grey BS381C/640 vs Regiment Grey

How close are they?

ΔE 4.3, very close: most people won’t see a difference side by side. Regiment Grey is a little lighter than RAF Extra Dark Sea Grey BS381C/640.

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

Yes, for most jobs. Very close match (ΔE 4). Regiment Grey is a little lighter than RAF Extra Dark Sea Grey BS381C/640.

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

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