What is the difference between old Audi A4 2015-2020 and new Audi A4 2015-2020?

The new 2013 Audi A4 is a facelift version of 2009 model. Its features new interior with some exterior cosmetic changes. Technically speaking the new saloon is now equipped with “Audi connect”, and Google integration while under the hood the V6 engine is been replaced by four Cylinder engine