You can use either curriculum with the Ashkenazi or Sephardic pronunciation. The series that you select will only determine which skills are included in that level. The Sephardic series included additional skills that aren’t taught in most schools.
Ashkenazi VS Sephardic Series
The two series differ in the skills they cover and the timing of when Sheva rules are introduced. For a detailed comparison, click here. To see the specific skills taught in each book, click here.