I see these as potentially the same thing depending on the details. There are some videos that show the gun was in a holster and not being messed with, etc. It also seems it could be from something hitting the holster (most reports include this). Whether the impact is from being dropped or being struck in the holster (or even vibrations as the one report mentions) is essentially the same - kinetic energy transfer to the gun. The question now is are some of the reports of discharging in the holster due to lies, holster design, debris, etc. I haven't found any official drop testing with the new FCU that found an issue (unofficially there are some, but who knows if the person really has the new FCU in those posts).

They are not the same issue. The drop safety issue was when the pistol was dropped at a particular angle (that wasn't part of standard tests—how it was missed!), the trigger was massive enough and the trigger pull was light enough that inertia would lead to the trigger moving to the rear, causing the firearm to discharge. It was a very specific failure nothing like any of the alleged uncommanded discharges.

The trigger movement wasn't enough to fully depress from my understanding. The problem is, even a slight depression of the trigger disengages the striker safeties. Most of the uncommanded discharges dod alleged that the gun or holder were struck. There are multiple standards for drop tests requiring various angles and heights.