User blog comment:Assassin of 81/connor's voice?/@comment-189.191.61.164-20120611172931/@comment-5503561-20120611175851

You mean the cutscenes or regular gameplay? If it's the latter, he's got most of Ezio's voiceover for climbing and freerunning, so there's that.

As for cutscenes, it's similar, but definately a different actor from Al.