Looking around a bit more, my guess is the 2015+ Edge carries over the most recent Fusion hub design, which appears to be 5x108 @ 63.4mm CB.
So that would be why they're different, Ford seems to make it hard to find the info on what seems like a pretty straightforward set of measurements. And all the random aftermarket wheel sites all have different specs listed for Edges & Fusions...
-SJ