I was under the impression that instead of making Boba's voice in ESB match AOTC, Adywan was considering modifying Jango's voice (when wearing the helmet) in AOTC to sound something more like Boba's original voice. So he'd still be making that a consistency of sorts between the Prequels and the originals.

Someone already said they didn't change Vader's voice to match Hayden's, and regardless of the actual SOUND of his voice, he doesn't deliver lines anything at all like James Earl Jones.

I like the idea of Jango's voice being the one that gets changed, so when he puts on the helmet he sounds more theatening. Heck, just remove Jango's lines altogether when he's wearing the helmet, he's more intimidating the less he says anyway.