Not sure about the differences but this one about the Xperia Plus H4493 http://talk.maemo.org/showpost.php?p...6&postcount=17 seems important as it is missing an LTE band used in Europe.

Have a look here https://www.phonemore.com/sony-xperia-xa2/models/1794 for more info on the different versions or just here on TMO http://talk.maemo.org/showpost.php?p...53&postcount=3