Nymph Green vs Undergrowth Green

How close are they?

ΔE 11.6, fair: the same colour family, but not a straight swap. Undergrowth Green is a little darker, more muted, warmer than Nymph Green.

Can I use Undergrowth Green instead of Nymph Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Undergrowth Green is a little darker, more muted, warmer than Nymph Green.

Can I use Nymph Green instead of Undergrowth Green?

The same difference applies the other way round: Nymph Green is a little lighter, more saturated, cooler.

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.