Can the Scion Navigation System be used in an xA?

I know virtually nothing about cars, but it occurs to me that the size, shape and basic characteristics of the new Scion Navigation System intended for the 2008 xB, xD and tC is no different from the size, shape and basic characteristics of the standard audio system within my 2006 Scion xA. uming the connections on the back are the same, what if anything would prevent the new SNS from being installed into my xA? Can I install the new Scion Navigation System into my 2006 Scion xA?