What are the differences between the Audi A4 35 and 40 variants?

I am considering buying an Audi A4 and I noticed there are two variants: 35 and 40. Can you explain the technical differences and what they mean for the overall performance of the car?

The main difference between the Audi A4 35 and 40 variants lies in their engine size. The 35 has a 2.0L four-cylinder engine while the 40 has a more powerful 3.0L six-cylinder engine. This means the 40 will have better acceleration and overall performance, while the 35 will offer better fuel efficiency.