Different power cords may well make a difference in sound as a result of their build quality and electrical properties.
But my mindset on this is that this part of getting good sound is not rocket science, and most differences are splitting hairs. Just get a good quality power cord from a reputable vendor, not necessarily and audio "boutique" or high end audio specialist that talks about "the sound of their wires" as if that is anything that you could bank on, and you should be in pretty good shape. SHould not cost very much. Then move on to bigger fish to fine tune the sound as needed. Other power tweaks may or may not help as well but the results are hard to predict, so address the things that are known to result in good sound first, and deal with the bigger gamble factors later.
But my mindset on this is that this part of getting good sound is not rocket science, and most differences are splitting hairs. Just get a good quality power cord from a reputable vendor, not necessarily and audio "boutique" or high end audio specialist that talks about "the sound of their wires" as if that is anything that you could bank on, and you should be in pretty good shape. SHould not cost very much. Then move on to bigger fish to fine tune the sound as needed. Other power tweaks may or may not help as well but the results are hard to predict, so address the things that are known to result in good sound first, and deal with the bigger gamble factors later.