At the moment i have scheduled my RHCSA EX200V8 exam. However, i want to change it to version 9 but i have learned a course with RHEL version 8. Are the topics different? Or can i learn the V8 based course and do the V9 exam?
Yes . . . kind-of. The vast majority of the RH124 and RH134 material - the training that covers the RHCSA exam - is the same.
Some of what's different is that
Stratis (update: I am wrong, Stratis is still taught) and file access control lists have been removed. VDO has become part of LVM, and containers have been expanded.