Orange Neon vs Bile

How close are they?

ΔE 104.0, loose: different enough that you should pick on purpose. Bile is noticeably lighter, cooler than Orange Neon.

Can I use Bile instead of Orange Neon?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 104). Bile is noticeably lighter, cooler than Orange Neon.

Can I use Orange Neon instead of Bile?

The same difference applies the other way round: Orange Neon is noticeably darker, 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.