Think of the ACT and SAT. If a test taker takes two different tests (e.g., different tests on different dates), that test taker's scores would be interpreted in the same way, even when there are different numbers of items or different item difficulty between the two tests, and they indicate the same level of competence.
For the APAC-BE, a candidate’s raw score is changed to a scale that ranges from 0 to 500, where 300 is the pass point. Therefore, regardless of how the test difficulty changes over time, the scores are reported and interpreted in the same way. That is, a score from 300 to 500 will always indicate a passing score and a score from 0 to 299 will always indicate a failing score.