Mixed standoff screws tragedy :(

Hi, I had to repair my IPhone 7 Plus volume button, screen and battery. I bought parts from iFixit store. I bought even a magnetic mat for parts. I had everything organised, until my parrot decided to make dance or whatever it was on table. Whole mat went on the ground and now I have no idea, where standoff screw should go. I mean I have tutorial and i know the place in board where I have to screw them, but every standoff screw looks different, their heads are bigger and smaller and I dont know which one should go where :(

Can anyone help me? Have you got like HQ photos of those screws? In iFixit tutorial, I can’t recognise any :/