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"How much difference in hang height on the tower is there between the two."
If hang height is really an important issue, then look very carefully at the photo by smorris7 to get an idea on the actual XM9 hang height. Exile lists the pod diameter at 10.0" and the total hang height at 10.5". That (10.5") is likely not possible (with only a 0.5" difference), as you can see, from the bottom of the tower tube to the bottom of the pod. And the distance may have changed if the neck is longer on the newest collar.
And double check and critique the Wetsounds in the same way. Different collar options make a difference.