Bile Yellow vs Jungle Green

How close are they?

ΔE 16.8, loose: different enough that you should pick on purpose. Jungle Green is a little darker, more saturated, cooler than Bile Yellow.

Can I use Jungle Green instead of Bile Yellow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Jungle Green is a little darker, more saturated, cooler than Bile Yellow.

Can I use Bile Yellow instead of Jungle Green?

The same difference applies the other way round: Bile Yellow is a little lighter, 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.