If the system is primarily electronic (as in gas pedal -> signal -> ECM -> signal -> throttle body and injectors), I could definitely see many or all of the mechanical system components being the same. After all, if all the gas pedal does is send a 0-10V signal to the ECM, why would a Corolla need a different one than a Tundra?
I don’t know, I’m just guessing that the dimensions and geometry of a Corolla to a Tundra will mean different mechanical parts, whereas OTOH, the ECUs can all be identical. I’m just guessing though. But for sure, the floormat story was bogus from the start, and part of a coverup. People who tossed the floormats out last year after earlier warnings have had total runaways, with no foot on the gas pedal, while in cruise mode or coasting.