You may see a B suffix at the end of orderable part numbers on the original label of JWPF series connectors from JST. Confirmed by manufacturer, the -B is a suffix that is internal to JST-USA. The part is exactly the same with or without this -B suffix.
Applicable part numbers
| DK Part # | Mfr Part # |
|---|---|
| 455-1991-ND | B02B-JWPF-SK-R |
| 455-1992-ND | B03B-JWPF-SK-R |
| 455-1993-ND | B04B-JWPF-EK-R |
| 455-3330-ND | B06B-JWPF-SK-R |
| 455-3331-ND | B08B-JWPF-SK-R |