as title says. I see both have same input standart serial input (MSB first in BTC) I thought its direct swap , but reading Diyaudio threads found oposite claims. thanks a million.
No. You will have to adapt the incoming audio data to account for the larger input register of the PCM63 and that will depend on the source of the audio data. A digital filter will take care of the needed adaptations if one is present else you'll need glue logic.
I see. the problem is that its wadia. nothinng common to other dacs inside. it even does not have digital receiver like cs8412/wm8804 etc.