Body Scan 2 support pages are up
The Withings site has the Body Scan 2 support pages up. Already one difference between the EU and US models: Nerve Health Score is EU only. US has Electrodermal Activity.
Info page for the EU model has quite a bit of info describing how it works and why it's important, the US page is dumbed down quite a bit, probably to keep the FDA at bay. Yet it looks like it is the same measurement and scale with just a name change.
https://support.withings.com/hc/en-us/sections/42614337148049-BodyScan-2
So far, this is the only obvious documented difference.