Obviously different features and trim packages are a major difference in the Sorentos.
Warranty is different
US Sorentos built in US, AU Sorentos built in Korea
US Sorentos have gas (petrol) engines only, AU Sorentos are also available with a diesel engine
My Garage has: 2006 Sedona EX 3.8L, Loaded, 214k miles----2006 Sedona LX 3.8L, Convenience Pkg, 242k miles----2007 Optima EX 2.4L, Loaded, 87k miles----2007 Rondo LX 2.4L, Convenience Pkg, 54k miles----2009 Amanti 3.8L, Loaded, 62k miles