Hi, good question. The product systems do not copy the process data sets, but just contain a reference to the datasets, thus you can use the same dataset in different product systems but it is litterally the same dataset. If you change the dataset, it is changed in every product system. If you indeed need two versions of a dataset, then better
a) make a copy, and modify the copy and use this copy in the other product system, or
b) introduce a parameter in the process, and change the parameter. This works since the parameter can be changed in the product system
Hth, best wishes,
Andreas