There is only one KIA minivan (Sedona) and they only come in one length (they're not like the old school SWB/LWB varying models offered by Chrysler). The only difference between the two models offered by KIA are options (LX v EX)/features, that will no effect on the ability to carry passengers/cargo, they even have the same seating configurations (2, 2, 3).

However there are more then KIA's on the lots, Sienna's are also pretty common as are the general run of the mill Caravan/Town & Country models.