Two Sedans with more similarities, such as the body structure, starting price, ground shadow size, height, and maximum occupancy, than differences, like the powertrain, horsepower, model year, and fuel economy. First of all, the is a newer vehicle by 2 model years. Also, the 2016 Optima Hybrid has a more powerful engine than the 2014 Passat Diesel, but it gets 2 more miles on a gallon of fuel. Among similarities are the body structure, starting price, ground shadow size, height, and maximum occupancy.