Initially, when you purchase an exam we had to choose the version as Red Hat offers exams on more than one release of their products.
Now you could purchase the exam, and later when you are scheduling it on the Scheduler, you could choose the appropriate version. Please refer to the below screenshot.
Yes, true. More can be found here:
Take charge of your Red Hat Certification journey with more flexible exam scheduling
@rg_kwonyou were interested I think