What does the (P) or (PP) suffix at the end of some JST part numbers call out?
Per JST FAQ page; The (P) or (PP) suffixed to the part number is an internal reference for JST. The (P) or (PP) indicates a change made to the inner and outer package labeling. It does not affect the physical part and it will not be shown on the product specifications.
Source - FAQ | JST Sales America