After a few months testing I can't spot any quality difference in the screen, other than that the phone with a replaced screen might run a little bit warmer. Don't know if it's a software difference, of if it's because of the hardware change, or because I didn't manage well enough with putting back the heat tape...
The no-backlight problem is a connector not put back. If the touch isn't working properly, that's probably also a connector not put in correctly/all the way.
You didn't plug in the display cable correctly. I think it's the one next to the battery, and it's really rather tricky to get in correct. To even have a chance you need to lift up the main board and put it in viewing the connector, and it needs to be pushed in rather hard without damaging the cable...
The hardest part of this guide was the first step, to insert the prying tool. I guess you just learn how to do it properly eventually, but this was the only phone I intended to repair.
The other thing is that the front-camera didn't want to come lose. You have to use a little bit of push in the right direction to get it out. I pulled the main board out of the camera first, then carefully lifted the camera out, put the camera back in, and then attached the screen. The screen cable needed some force to enter the connector all the way in for me. (Might want to add that to the mainboard part, last step.)
Then I had one really annoying LED cable that refused to be positioned correctly and I never realized until I had about one screw left of the frame...
The phone has a lot of random sticky tape so quite some few things you have to use a lot of force for.
At least at a brief glance they seem to have the same production ID. I bought another padfone 2 to have (I didn't want to be without phone), so I can do a serious comparison with test images later if it's interesting.