Violent Vermillion vs Ratskin Flesh

How close are they?

ΔE 17.3, loose: different enough that you should pick on purpose. Ratskin Flesh is a little darker, much more muted, warmer than Violent Vermillion.

Can I use Ratskin Flesh instead of Violent Vermillion?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Ratskin Flesh is a little darker, much more muted, warmer than Violent Vermillion.

Can I use Violent Vermillion instead of Ratskin Flesh?

The same difference applies the other way round: Violent Vermillion is a little lighter, much 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.