Super Voyagers can tilt, normal ones can't.
Expanding on that, almost all the SuperVoyagers are 5-car, the Voyagers just 4. The SuperVoyagers in use with CrossCountry have now had their tilt deactivated.
Super Voyagers can tilt, normal ones can't.

Virgin are getting some of there voyagers back from XC as there getting HST`s in if you see a Voyager in VT livery its a 99.9% chance itll be a Super voyager
Also worth noting, is the fact that all Welsh Super Voyagers are now re-lettered, meaning that coach A is the quiet zone, with B, C, D(Shop/First Class), and E (First Class/Kitchen Galley).
As for double-sets with the new re-assignment of letters.. goodness knows!
How bizarre...
Not so fussed anymore, I've retired from Voyager bashing! Still, didn't know it was going to happen!