I'm not a petrolhead so don't know much about cars and therefore can't give you the technical terms of how I distinguish between the various models but...
Mrs Lambigadi 1.0 is a Mercedes Benz, this is a BMW. This is the one Imlie drove to the office as CEO for the day.
Unfortunately cars these days have started to look alike but most carmakers try make their cars as distinct from the next carmakers as possible with some notable things. Eg if you look at the grills of Mrs Lambigadi 1.0, this Beemer and the one he was driving yesterday you will notice they are all different. Look at the number of chrome slats and how they're placed.(horizontally, vertically or something in between)
Also the placement of the insignia. I know the distinctive makers one has been replaced with an A for Aryan but you can still see where they were originally. Mrs 1.0 has a raised one on top of the front hood of the car. (Mercedes Benz does also have some models with the insignia in the middle of the front grill but not on the model of the car used in Imlie). Yesterday's Mrs Lambigadi was in the middle of the grill and the Beemer's is lying flat on the hood.
The wheels too. Look at the hubcaps for starters, the hubcaps of the Beemer have the distinctive blue and white markings of BMW as evidenced by the picture with Fahmaan leaning on the car.
The interiors of the cars too are markedly different. The shape of the seats, the shape and size of the headrest even the thickness and softness of the leather can be different.
This is not a complete list of all the tell-tale differences by the way, just some of the random things I use.