Is there a difference between the Audi A3 and Audi A4 engines?

I am considering purchasing either an Audi A3 or an Audi A4, but I am unsure of the differences between their engines. Can anyone with knowledge of Audi vehicles shed some light on this?

Yes, there are significant differences between the engines in the Audi A3 and A4 models. The A3 comes with either a 2.0L turbocharged four-cylinder engine or a 3.2L V6 engine, while the A4 offers a 2.0L turbocharged four-cylinder engine or a 3.2L V6 engine, as well as a 3.0L V6 engine in some models.