I found a Safety Data Sheet for Honda DPF II.
https://www.collegehillshonda.com/sds/08200-9007sds.pdf
It's made by JX Nippon Oil & Energy USA Inc. That company also sells this:
https://www.eneos.us/product/eneos-import-dps-fluid/ which they market as being sufficient for both DPF II and DPSF. I quote:
"ENEOS Import DPS Fluid is dual pump system fluid engineered specifically for Honda and Acura vehicles that require Honda Dual Pump Fluid II and Acura DPSF Genuine Fluid."
I'm gonna take a wild guess and say that all 3 are the sam tang.
I could not find an SDS for Acura DPSF, and since companies legally have to post SDSs, I'm going to guess a regulator who calls Honda asking about DPSF gets a letter from Honda Legal certifying that they're the same, and a copy of the DPF II SDS.
I was looking for the CAS number for both so I could compare the two and see if they had the same CAS number, but the CAS number only says, "trade secret".
Wait, now that I compare the SDS of the Honda DPF II and the SDS of the Eneos, I see that the density, flashpoint and some other factors are slightly different between them. So at least those two are somehow different. Maybe DPF II and DPSF
are different, and the Eneos splits the baby so that they can market a single option to indy shops. But it's telling that the company that makes the fluid for Honda (Honda and Acura) also sell their own, and says it's good for both. We're probably boiling the ocean here.
Of course if your diff blows up you can't exactly send anyone a bill. Again I revert to the idea - I should just put the Acura spec. in my Acura and not eat a cheeseburger that week.