Yeah, I would guess on the sound being pretty much the same throughout. And arenas get really loud when the crowd screams, with the sound bouncing off the roof & walls. You could always wear weak earplugs. It wouldn't be my top choice, but you really could if you have sensitive ears, like the kind that don't block too much sound, but enough to protect them a bit.
When I was a kid I thought the adults who wore earplugs at concerts or held their ears at times were so lame (you know, if it's too loud, you're too old). Even after I lost my hearing for 24 hours following an exceptionally law-breakingly loud 10th row Aerosmith concert, ahem. But in my early 30's I saw Prince in Key Arena in Seattle and... holy cow... my sister & I both had to hold our ears. It actually hurt. I suddenly felt way old, lol. It wasn't due to the music being way too loud, but to the combo of music plus the crowd! Wowee! Maybe it was just the acoustics in that arena. The older I get, the more sensitive my ears seem to be. Weird. (But I'll suffer for MJ a bit again ;-)