Cars are different but they all use the same system. As compared to computers you could almost say there is only two different car operating systems, standard and automatic. No matter what the hardware looks like (the car model) all your automatic cars are going to have a steering wheel in the same place, two pedals that do the same thing, a similar/same gear shifter, etc. You can jump into any car and know how it operates regardless of model; that's pretty much the same as having different computers (hardware) running the same OS.
The steering wheel isn't necessarily in the same place (left side/right side). I've seen many different implementations for reverse on a manual transmission. Hell, what about setting the clock on the stereo? That's never consistent. And I still can't figure out the headlight controls on my car. Sure glad they're automatic because I'm sure as hell not reading the manual! Also, I hate large cars because I have no concept of where the back is.
No, I don't have a point. But my point still stands.