Here are some of their shared specs to give you an idea:
The 2014 Toyota Prius does have slightly more horsepower at 134-hp to the 2013 model’s 98-hp. But almost everything else from the torque (105 @ 4,000 rpm), exterior and interior dimensions, and even the original MSRP of $24,200 are pretty much identical.
That said, the market value today for the 2014 Prius runs slightly higher depending on your location and the vehicle’s condition. Therefore, if it really comes down to it—you may just be better off going for the cheaper 2013 model.