As always, thanks for putting this up Steve. These things are always hard, but I actually got a lot out of this and found it quite revealing. I listened to both nights as well as the recordings from Bean, just to get a sense of possible FoH mix differences.
The one definite is that the Zoom is a touch brighter in the preamp section than the PSP3...
At this point, this is my initial reaction. But I don't think it's just a touch brighter, I think think it sounds as though the high-end EQ was cranked up 8dB and exactly like the tell-tale sign I hear when I've gone way overboard with the high-end EQ in post.
For me, it's most revealing during loud audience roars. I would recommend listening to the end of "Cream On Chrome" from both Steve and Bean on night 2. Listen to the end of the track. The guy screaming near the mic stand sticks out like a sore thumb to me on the Zoom only recording. It's incredibly grating on my ears and sounds distorted. On Bean's, it's certainly loud, but not harsh.
Having listened to all 4 source (2x Steve, 2x Bean), my opinion is that the PSP-3 recording from night 1 and both 70d recordings have far better balance. Definitely more potential for work in post. With the Zoom only recording, I think it needs legitimate first aid... a high-end cut for sure.
My opinion isn't made up just yet, but from these recordings I'm hearing a pretty glaring difference in frequency response.
