I've only seen two designs of magnetic USB cables. The most popular is round, and I've confirmed different manufacturers' tips/cables are fully interchangeable.
The other style is oval shaped, and those would obviously be incompatible.
And what's the worst that happens? I might eventually have to switch to normal, horrible cables, like you use every single day? Enjoy wearing out your cables and devices...
From my understanding, this violate the spec potentially connecting all the pins at the same time which causes some sort of spike in power which is bad?