Both the PCN and the NOR truncate the period in which to make representations
For accuracy, the former is reps, the latter an appeal.
Irrespective of a tribunal's own practices, an owner's statutory rights are what must be stated in a NOR. Previous notices etc. merely refer to this right, but it is the NOR alone which specifies these statutory rights.
It MUST be correct. No ifs or buts, no it doesn't make any difference in practice, no the owner wasn't prejudiced: IMO, it must be correct.