Understanding Society User Support

Hi,
I need to merge CNEF datasets and so cannot use the harmonised BHPS UKHLS dataset. I will, however, use the harmonised dataset to attribute the correct pidp values to the BHPS members.

Can you tell me whether, for every BHPS individual who has a pidp in the harmonised dataset (who will be found using their pid number), are the pidp values distinct from the pidp values for individuals in the UKHLS dataset 2009- onwards?