My dealer recommended 2 meter for more “conditioning”. I had never looked at it that way. I have two AudioQuest Hurricanes, one one meter and one two meter. So I did a comparison with my stereo amp. I use them both when running the mono blocks. I can’t tell the difference. But audio is all about small additive improvements. So, one should definitely use the same length.
The two meter definitely sounds better. While they are clearly the same power cord the 2 meter is a bit quieter. Definitely worth the money.