I really appreciate you taking the time to look into this. I recently purchased a set of JST PH connectors from Adafruit that said “Compatible with Grove!”. They are not compatible. The pins have the same spacing, but are not vertically aligned in the connectors and the plastic tabs and slots that ensure correct alignment are not at all the same. A JST PH connector won’t physically fit in a Grove header. I emailed Adifruit asking why they made this claim and got an automated response to post on their forum. I posted to the Adafruit forum as well and it has gone unanswered.