Navi Version

My 2007 accord has navi version 1.35.A friend who just got a 2007 accord has a higher version.(4.27 or something)His car was built may 2007,mine late
2006.Should the versions be different?They are both 2007's,or did my navi dvd get swapped?(His is a v-6,mine 2.4 4cyl.)
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