The BATC shop only supplies the hard to get parts and PCBs
Lots of help on the wiki for the different projects.
The BATC Shop offers the FTM 4762 NIM and the FTS-4334LU NIM, but the BOM lists the FTS-4335 and the FT2232H_Module.
The Portsdown 4 Wiki doesn't appear to offer a BOM at all.
Maintaining a BOM is very tedious, (parts go out of favour fast these days). When I built my Portsdown2018 I cross-checked the circuit diagrams with the parts and slowly added them to the Digikey order. It takes house, but it helps with understanding of part sizes and specs.