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I dont know what u did to cause that so not sure if I should recommend a repair, however first thing to try would be a new screen, not sure if u still have the home button and the top camera flex seems torn as well. Reemplazar pantalla de un iPhone 7

Heres the screen Moto G6 Screen And the guide for replacing it Motorola Moto G6 LCD Assembly Replacement

The board itself holds all the data well a specific chip on there holds it… it's not so simple to just get just the data element over to another phone, it's more practical to fix the board… In order to transfer the data would require a lot of skill havent really worked too much on the xr but I'm assuming it's similar to other iphones, u would need to transfer the eeprom, nand, baseband and cpu to another board and possibly others like wifi if u cant reprogramme the nand. That for data recovery isn't very practical ur better off saying what's wrong with the phone exactly for better advice

Nope nothing is ever interchangeable apart from maybe the 2 bottom screws…

It should just plug in check it's been folded like the original and it should just plug in compare it to the original battery just in case u have the wrong battery for the phone...

Really ifixit is for people to fix their own stuff so have a look if there is a guide available for ur item and take them apart and see what u can do...

Step 19 is sticking the home button down u would just use the widest u can and trim off the excess or use more thinner ones next to each other, which ever u have or whichever is easiest for u, ur just trying to stick the bracket down...

A picture might help but sounds like a broken screen so far…

The connector on the 6s isn't too bad its mainly the plus that is temperamental because the connector is physically longer... The problem u describe sounds more like a faulty screen. Disconnect and check the connectors though make sure it's not bent and the pins dont look like theyve come away from the flex

It looks like rubber bung that goes on the metal bottom of the screen that the bottom screws go into, there should be 2 one on each screw