Just checked my daughter’s first-year transscript. Barnard transferred 24 credits for 7 AP classes, but none for two different dual-enrollment classes.
We had ordered a transcript from a major OOS public university, and one from the local community college, both to be sent to Barnard. It’s something I’ll eventually follow-up on, just to confirm that it had been received, but was not found to be equivalent/sufficient - but in hindsight I suspect the fees I had paid are lost. Of course, since neither her nor us knew her final choice until the second to last possible day, I certainly couldn’t have predicted Barnard 2+ years earlier when I was opting to “invest” that money.
I think a general answer would be: AP / IB credits will be more predictable, because those are nationally standardized, while Dual-Enrollment credits are more likely a case-by-case decision.