User blog comment:Commdor/Mass Effect 3: Leviathan trailer released/@comment-5503561-20120824210445/@comment-4950455-20120824221230

All Reapers sound alike. Sovereign definitely had a different voice actor, and I'm not sure who voiced the Destroyer on Rannoch, but they also sounded pretty much the same.

Also, I'm kind of doubtful that there's a connection between Leviathan and that CDN storyline - I always assumed the attackers were meant to be Collectors, based on the report describing the EAE ships being boarded.