The curriculum (PDF in german) contains the legal requirements for the selected bachelor. It also lists the set of courses that must be completed, with their ECTS workload, and other required curriculum components and also all necessary regulations and explanations (courses, elective subjects, practical components, modules, …)
As of October 2016, all new registrations are on the 2016 curriculum.
Transfer Recognition Regulation
In regards to switching to the 2016 curriculum, exams are recognized as stated in the linked transfer recognition regulation (PDF Anerkennungsverordnung). This states that no other formal steps are necessary for this transfer. Furthermore, individual transfers remain possible.