In the semiconductor industry, "Copy Exact" is much more than just a request for a consistent part number. It is a strict quality philosophy—originally pioneered by Intel—that mandates a power supply must be identical in every possible way to the one originally qualified for the "tool" (the manufacturing machine).
In a world where a single silicon wafer can be worth 50,000$ and a machine costs 150$ million, even a tiny change in a e.g. capacitor's brand can cause a "process shift" that ruins production.