Maybe this isn't really DIY, but I would like to know a little bit more about it so that I can do some of my own comparing and make sure I am making the right decision finally. Here is a photo of my future flat, but with the current tenant's oven & stovetop:

I found a combo that I liked, mostly because it was an induction stovetop. But upon showing the picture to the guy at the store, he said that the model would not be compatible, because of a difference in the electric wiring. I don't remember exactly what model it was (I didn't bother writing it down since it was apparently incompatible), but he explained it to me that, effectively, the oven in the apartment has 4 knobs on the oven which control the stovetop, and the model I was looking at only had two knobs (for the oven itself), and then the controls for the cooktop were on the cooktop itself. He said it was possible to install the model I was looking at, but it would be significantly more expensive because they would have to re-do a lot of the electrics.

He also told me that there are indeed induction models with the "4 knobs on the oven" setup, but that they are also significantly more expensive.

What I would really like to know however is the technical terms behind this so that I can do my own research and shop around a bit. What are the actual technical terms for these "4 knob on the oven" vs "2 knob on the oven and controls on the stovetop" setups?