I suspect that there would be firmware differences in the System Area on the platters. In any case, even if you were replacing a PATA board with an identical PATA board, you would need to transfer the "U12 ROM", or its contents, from patient to donor. This is because most modern HDDs store unique, drive specific "adaptive" information in a serial EEPROM chip. http://www.pcbfordatarecovery.com/media/catalog/product/cache/2/image/9df78eab33525d08d6e5fb8d27136e95/W/D/WD800BB-22JHC0_2060-701292-000_REV_A_PCB.jpghttp://cdn103.iofferphoto.com/img3/item/104/114/535/wd800jd-2060-701335-005-rev-a-western-digital-sata-pcb-d462.jpg
BTW, notice that the first photo shows a very oxidised 20-pin preamp connector at the bottom right corner. These pads can be cleaned up by gently rubbing them with a soft pencil eraser. The fact that this PCB is being offered for sale in that condition makes me want to avoid that supplier. I have also seen other PCB suppliers using photos that show physically damaged components.