2016 Audi A4 is the newer version with some differences, such as the model year, starting price, and horsepower.. First of all, there is a notable difference in the starting price of the 2013 Audi A4, which is $3,400 less than the base MSRP of the 2016 Audi A4, which is three model years newer. And finally, the 2013 A4 produces fewer horsepower than the 2016 A4. Among similarities are the body structure, market segment, fuel economy, ground shadow size, height, and maximum occupancy.