Death Guard Green vs Dark Green (JGSDF)

How close are they?

ΔE 17.4, loose: different enough that you should pick on purpose. Dark Green (JGSDF) is a little darker, more muted, cooler than Death Guard Green.

Can I use Dark Green (JGSDF) instead of Death Guard Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Dark Green (JGSDF) is a little darker, more muted, cooler than Death Guard Green.

Can I use Death Guard Green instead of Dark Green (JGSDF)?

The same difference applies the other way round: Death Guard Green is a little lighter, more saturated, warmer.

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.