The OEM for AMD / Radeon memory changed quite recently from Patriot to Dataram so there is no accurate info available for the ICs.

The Entertaiment Edition & <1866MHz Performance Edition modules are either Elpida or Micron rev. D/E.

Getting 32GB of guaranteed Hynix MFR based RAM for cheap is tough.
I'd say getting Kingston is the most certain and probably the cheapest way too.

If you don't plan to use the iGPU of APU the memory is pretty much irrelevant.
There is no noteable performance increase above DDR-1600 on CPUs / NPUs.