Is this strictly for the early 2020 MacBook Air, or will this same technique work for the late 2020 MacBook Air?

Better yet, after reading Step 49 - no need to remove SATA cable from the bottom of the hard drive tray.

I am following these procedures for the following: iMac Retina 4K - 21.5" - 3GHz Quad Core - Radeon Pro 555 2GB - 4GB/4GB (8GB total - 2 slots) 2400MHz DDR4 SO-DIMM - Mid 2017 - Model: MNDY2LL/A - iMac18,2 - A1418 - 3069. In my case, the SATA cable is clipped into the bottom of the hard drive tray. Pull the hard drive tray up slightly and angle to reveal clips. SATA cable pops out from the side of each clip.

This iFixit tool (iFixit Opening Tool) will be your best friend when it's time to install your new 2.5" hard drive. Simply hook the tool to the back top corner of the iMac SATA adapter, connect your hard drive loosely to the SATA ports and use the tool to pull the SATA adapter forward into the hard drive.

I’m curious. I am having a “double image” issue on my 2012 MacBook Pro 13” (unibody). Would replacing the display solve this issue?

Double image: There is an exact copy of whatever is on the screen appearing just below the “real” image. A ghost, or shadow image if you will. When I connect an external monitor to the laptop no double image is seen upon the external monitor, but still is prevalent on the MacBook screen.