Elf Green vs Olive Drab (JGSDF)

How close are they?

ΔE 9.0, close: similar, with a visible difference side by side. Olive Drab (JGSDF) is a little lighter, more saturated, cooler than Elf Green.

Can I use Olive Drab (JGSDF) instead of Elf Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Olive Drab (JGSDF) is a little lighter, more saturated, cooler than Elf Green.

Can I use Elf Green instead of Olive Drab (JGSDF)?

The same difference applies the other way round: Elf Green is a little darker, more muted, 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.