Yeah I thiiiink I can detect a difference when I'm listening for it, but zero chance I'd have picked up on the voices being different if I didn't already know.
It's mostly Rick when he's shouting. Everything else is on-point. Even Roiland himself sounded slightly different last season so the transition isn't all too rough.
I think it’s most noticeable when he’s trying to add inflection for an emotion. Like when Rick says “baby” or “shut up” in the trailer, that’s the most notable for me.