WWI German Light Green vs Eau de Nil “D.E.G.”

How close are they?

ΔE 15.6, loose: different enough that you should pick on purpose. Eau de Nil “D.E.G.” is noticeably lighter, more saturated than WWI German Light Green.

Can I use Eau de Nil “D.E.G.” instead of WWI German Light Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Eau de Nil “D.E.G.” is noticeably lighter, more saturated than WWI German Light Green.

Can I use WWI German Light Green instead of Eau de Nil “D.E.G.”?

The same difference applies the other way round: WWI German Light Green is noticeably darker, 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.