I have setup our annual map production in ArcGIS Pro Map Series from ArcMap Data Driven Pages. It was a painless process. The only issue I noticed is the map PDF exports from ArcGIS Pro are 3 times the size of the PDF exports out of ArcMap. I have attached the settings from both ArcMap and ArcGIS Pro. They look similar, but I am probably overlooking a setting that would shrink the file size. Thoughts?