Just curious, do you need to do all the compliance tests and certifications again after a part was changed to a different brand or suffix number?
Not usually unless the part was safety related (Fuse, Opto across an isolation barrier, transformer, stuff like that) or you are in a regulated industry (Medical, safety critical applications, avionics...).
I would note that many of those parts seem to have very close equivalents, there are only a few really unique parts being discontinued (Those high current buffers being the boring ones, but there are near equivalent parts there, at the cost of a minor board respin).
This is why you try to NEVER design in a single source component unless you really have no choice in the matter, and for line evel audio at lowish impedance there is little wrong with the 5532/34 which is second sourced by **EVERYONE**.
Regards, Dan.