I am usually not interested in this stuff seeing as I do not have any foreseeable plans of cracking one open (how could I? I don't even have the phone yet haha!)
Anyway, here are the images,
First, here is the Lumia 920 stripped apart
Next is the Lumia 820...
I found it fascinating the different shapes and sizes of motherboards on phones these days, I guess the more hardware features you want to shove into a phone, the more room you will need and given the size constraints, motherboards, panels will only have to get smaller and come in more awkward shapes to fit into that shell.