What is the difference between the Audi A4 40 TDI and 45 TDI engines?

I am considering purchasing an Audi A4 but am unsure of the difference between the 40 TDI and 45 TDI engines. Can someone explain the technical differences and potential performance variations between the two?

The main difference between the Audi A4 40 TDI and 45 TDI engines lies in their power and torque output. The 40 TDI engine produces 201 horsepower and 295 lb-ft of torque, while the 45 TDI engine delivers 244 horsepower and 369 lb-ft of torque. This means that the 45 TDI engine offers greater performance and acceleration, especially at higher speeds.