Hello Marks57.
You have opened the door to a famous tweeker vs. geeker debate that has raged since Tesla invented the radio.
The short answer: yes it will make a difference
Justification: High end power cables have better connectors, shielded wire, and better wire (higher conductivity and flexibility).
But is the effect audible: --> Ah, there's core of the argument.
If you have the absolute worst case scenario, you may hear a difference. This would be one with lots of powerline noise picked up by the system and a voltage drop due to poor connections (wire to wall, wire to equipment, internal solders/crimps in the power cable).
Some people have bought the boutique power cables and SWEAR they heard a difference. Maybe they did, maybe they just really, really wanted to hear a difference because they spent $100 on the thing. Or maybe their old cable wasn't making a good connection at the wall and was losing some voltage due to increased resistance.
But if the equipment you bought came with a good quality cord that appears to be snug at both ends, you are probably fine.
I like making custom power cords for one reason: I can get the exact length I want. That's all, I don't expect a sonic difference. Less clutter, neater runs, less chance to send noise through a signal wire.
Hope this helps,
Anthony