Just like the old threads already covered ….
It’s the same base part number. They are the same. If it was totally different , it would be a completely different part number .
not only that, if I asked Acura to change my fluid and they tell me they have none and it’s back ordered for 6-months to a year under the Acura brand, how do you suppose they will change everyone’s fluid?
They will pick up some Honda branded fluid and call me when it’s done.
The A or any number thereafter could be distinguishing revision or even supplier or the sticker label. It also allows them to charge a premium under a slightly different part number.
I wouldn’t even worry about it. Do you see any threads from anyone “oMG my diff blew up with Honda branded DPSF-II”