On IMDB it appears that they have the same voice actors, but to me when I saw the movie his voice sounded a bit different. Same with Starscream's.
I actually liked how Charlie Adlers voice had the processed feel, it sounded kinda like G1, and I could understand him. I don't know if it was where I sat, but I could barely hear SS :\ And Hugo was much less menacing this time, didn't have the booming feel he had in the first.