There are differences in build though, we already know they changed wiring loom supplier early in production due to the Ukraine war. I don't know if they kept records about which cars got which parts, but that would be interesting to track. There have been reports of a number of wiring looms being replaced, and for a few specific issues (O2 sensors) there seems to be some correlation with water following a spray wash of the car. So there may be a problem with the weather-resistance some of the connectors in the wiring loom, which could create some very unpredictable outcomes with cars out in the real world if it does prove to be a widespread issue.
Also, the primary electrical variable between different cars that are otherwise built with identical parts is the one "variable-state" component in the system - the battery. I have a suspicion that MANY of the early builds were built with batteries that were either defective, or were damaged by some condition that they experienced in storage. The subsystem warning messages that many owners have experienced (that disappear after a reset or a long wait in the Off state) sound like issues I've seen in other vehicles when a voltage drop or voltage sag condition occurs, when the alternator can't keep up with the simultaneous current demand of the charging battery and the running vehicle systems. The fact that these errors seem to disappear on cars that are kept on trickle chargers reinforces this guess for me.