Let me be clear. In the first few seconds of the video, vehicle DWJ seems to be making some odd braking sounds. It seems to have some traditional sounding ABS/SC sounds in a few of the scenes; but later, I'm hearing a difference between DWJ and vehicle XSV, which to my ear, has an electric motor sound as it passes slowly in the turns, as you can hear at this particular spot:
You can hear it in multiple spots in the video, and you can also hear a louder ABS type sound on DWJ in multiple spots in the video.
Also, vehicle XSV is the first vehicle that is showing a fuel filler on the left side of the vehicle. I am pretty sure none of the other images we've seen show a filler location on the left, although it is easy to see that the fake body panels might be covering that spot in a few of the images. You can see, however, that it has an odd look, and has no lid. The fuel filler on the other side of this vehicle also has no lid, and also has an odd look for a traditional fuel filler. So this vehicle has two filler locations, both have an odd look to them.
Not sure what the exhaust type might tell us, probably just a different engine option. Both of these vehicles have the same engine, but only one has the dual filler location. Vehicle XSV has a GPS antenna on the top, as well as some other kind of instrument that looks like either a microphone, or a pitot tube. Not sure why that would matter, but it is something that has not been seen until it was seen on this vehicle.