Field Grey Base #2 (Grey Uniform) vs Olive Grey

How close are they?

ΔE 4.2, very close: most people won’t see a difference side by side. Olive Grey is a little darker than Field Grey Base #2 (Grey Uniform).

Can I use Olive Grey instead of Field Grey Base #2 (Grey Uniform)?

Yes, for most jobs. Very close match (ΔE 4). Olive Grey is a little darker than Field Grey Base #2 (Grey Uniform).

Can I use Field Grey Base #2 (Grey Uniform) instead of Olive Grey?

The same difference applies the other way round: Field Grey Base #2 (Grey Uniform) is a little lighter.

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.