Technically this is a design objective but again cannot be guaranteed. Service providers in most cases assure consumers that their software performs the same across platforms, but that is sometimes impossible to be achieved.
Same bits to the DAC yes could be but again not garanteed because PCM has no error bits with the signal like computer networks. PCM is like analog as no guarantee what comes to the DAC after the signal leaves the port.
I always appreciate scientific method for looking at matters. Unfortunately this domain is full with snake oil companies and uneducated consumers in many cases.
Regards.
Imad