Field Grey Base #1 (Green uniform) vs Dryad Bark

How close are they?

ΔE 11.0, fair: the same colour family, but not a straight swap. Dryad Bark is a little darker, more muted than Field Grey Base #1 (Green uniform).

Can I use Dryad Bark instead of Field Grey Base #1 (Green uniform)?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Dryad Bark is a little darker, more muted than Field Grey Base #1 (Green uniform).

Can I use Field Grey Base #1 (Green uniform) instead of Dryad Bark?

The same difference applies the other way round: Field Grey Base #1 (Green uniform) is a little lighter, more saturated.

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.