2016 Kia K900 is the newer version with some differences, such as the starting price, horsepower, and fuel economy.. First of all, there is a $5,500 difference in the base MSRP. The 2015 Kia K900 has a higher starting price than the 2016 Kia K900. And finally, the 2015 K900 has a more powerful engine than the 2016 K900, and it gets 1 fewer mile on a gallon of fuel. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.