Is it ok to leave off a screw? 1.2mm VS. 1.3mm

I replaced the battery on my iPhone 5S. And I didn't keep great track of which screw went where. I read that putting any other screw into the 1.2mm hole can kill your logic board. I also read that it's ok to just put the other 3 screws in and leave this one empty, not to risk it. Has anyone done this? Should I just buy a 1.2mm screw online?