Why do Audi engines have the same displacement but different horsepower?

I've noticed that different models of Audi cars have the same engine size, but some have higher horsepower ratings. Can anyone explain why this is?

The difference in horsepower is due to variations in tuning and performance enhancements specific to each model. The same engine can be optimized for different levels of power output based on factors such as fuel type and engine management systems.