Blue FS 35190 vs Toxic Mist

How close are they?

ΔE 16.9, loose: different enough that you should pick on purpose. Toxic Mist is a little lighter, much more saturated, warmer than Blue FS 35190.

Can I use Toxic Mist instead of Blue FS 35190?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Toxic Mist is a little lighter, much more saturated, warmer than Blue FS 35190.

Can I use Blue FS 35190 instead of Toxic Mist?

The same difference applies the other way round: Blue FS 35190 is a little darker, much more muted, 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.