Now that I've been on it a couple times since this voice has been "brought back", there's definitely a really subtle difference. I'm still convinced it is the same voice (the same voice actor). To me, it almost seems like the tracks in use now are the original un-edited ones as I always thought that the ones that played before had a lowered pitch on them.
I was also thinking this. It definitely sounds like that could be the case. When I listen to them back to back (Comparing Mara's voice - YouTube) it sounds like the original playing has more of a low booming almost echo like effect to it, while the newer playing sounds like the recording is unaltered. Regardless though it sounds good and is 100 million times better than that temp voice they used for 2 weeks or so but I will always be partial to the original.