Violent Vermillion vs Pumpkin

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Pumpkin is a little lighter than Violent Vermillion.

Can I use Pumpkin instead of Violent Vermillion?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Pumpkin is a little lighter than Violent Vermillion.

Can I use Violent Vermillion instead of Pumpkin?

The same difference applies the other way round: Violent Vermillion is a little darker.

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.