Well if you do wager, don't wager much because you will loose!
Even the ones that use the Van Doorne belt are in many ways significantly different from one another. For instance, different start-up clutch arrangements, different clutch materials, different oil pumps, different basic architectures and then we come to the belt. As you say, they all use a Van Doorne belt. But did you know that there are Van Doorne belts, and Van Doorne belts. Let me explain:- there are different belt widths and different belt lengths. The width difference means that the elements are a different size which affects torque capacity. The length difference means different numbers of elements in the belt. Additionally, there are various element designs and the belt construction varies in that some have more bands in the construction than others which also affects torque capacity. So, you see that the belt all by itself presents a number of different challenges which is why the vast majority, if not all, of the 'special' fluids that OEMs have developed for their particular CVT application is really needed to make the device work properly.