New Guinea Impatiens

[cardiffsteve]

A well known diy outlet say they are not selling Busy Lizzies this year to help growers recover from Impatiens downy mildew but are selling New Guinea Impatiens.

What is the difference between New Guinea Impatiens & Busy Lizzies?
Are New Guinea Impatiens not susceptible to downy mildew?

Just thought I'd ask