PESIT Banashankari has been converted into a private university under the PES University Act established in 2012. The first batch of students to join after this change was put under the affiliation of PES University. Naturally, after four years, they were awarded a degree by PES University.
A few other batches that may have been admitted under VTU affiliation, were continued under the same affiliation till those students graduated. As far as senior batches are concerned, they could migrate to PES University but it requires a lot of paperwork and it takes time. There are chances that the management will not opt for this.
In case you are still unclear about this and CET cell codes cause confusion, you can get in touch with the authorities who will help sort this matter out.