What are the key differences between the Audi A7 Prestige and Premium Plus models?

I am interested in purchasing an Audi A7 but am unsure of the differences between the Prestige and Premium Plus models. Can someone provide a breakdown of each model's features and pricing?

The Prestige model is the top-of-the-line A7, offering premium features such as a Bang & Olufsen sound system, head-up display, and ventilated front seats. The Premium Plus model has many of the same features, but lacks the head-up display and ventilated seats. Both models have a starting price around $70,000.