They are all different
As Blue Hauler and others have said, each individual approved operator has thier own system approved by CASA.
That means that lots of what is writen here may be correct for that operator or maintenance system.
There is no one rule, each aircraft and operator needs to be looked at individualy.
If you are flying same aircraft with same company, then it is not to dificult to keep on top of the system in use. If you are flying several different types from different organisations then you need to rehash each system reguarly to keep on top of it.
I find that flying both GA and airline style equipment from different organisations, that I need to review the GA MR's each time to ensure that I don't get caught.
Questions to the Chief Engineer will result in the correct answer, most of the time!