Can you tell which is which? You can tell just from the pic, but even side-by-side they look awfully similar.
One is an iPad 10.2" LTE model with 128 GB, and the other is an iPad Pro 10.5" WiFi model with 64 GB.
Weight and size: I don't know if the actually notice a weight difference, but the iPad 7 definitely feels thicker. It's quite noticeable, and much more so than I expected.
CPU: A10 feels a tad slower. The iPad 7 is more than adequate for most people for basic usage, but the Pro feels faster, esp. when compared next to it.
RAM: For basic usage they feel pretty much the same. iPad 7 is 3 GB and iPad Pro is 4 GB. I think 3 GB is the sweet spot for the average user.
Speakers: Worse quality on the iPad 7, and in landscape mode the sound only come out from the right side, which is really annoying. Sound is much better on the iPad Pro. Totally different league.
Laminated screen: Typing on the iPad 7 screen gives this sort of hollow feel to it. No such feel on the iPad Pro, and it feels closer to the finger. It's a noticeable difference.
WCG TrueTone screen: Missing on the iPad 7. I really like these features on the iPad Pro.
ProMotion: I don't miss it on the iPad 7. The much smoother scrolling the iPad Pro is quite nice, but I can easily live without it. It's not as if I try to read Safari pages while they're scrolling.
Cameras: Haven't tested them yet, but I suspect they kinda suck on the iPad 7, judging by its era. The camera in the iPad Pro 10.5" is quite decent, same as iPhone 7. OTOH, there is a big camera bump on the iPad Pro. Mind you the camera bump doesn't matter to me for the iPad Pro since I have a back case on it, so I don't notice the camera bump when I lay it on the table.