Drab Green vs Wilted Green

How close are they?

ΔE 17.4, loose: different enough that you should pick on purpose. Wilted Green is noticeably darker, more muted, warmer than Drab Green.

Can I use Wilted Green instead of Drab Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Wilted Green is noticeably darker, more muted, warmer than Drab Green.

Can I use Drab Green instead of Wilted Green?

The same difference applies the other way round: Drab Green is noticeably 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.