It's type-approved to ECE regs, not certified to American SAE standards. That's a non-issue from the performance standpoint; the US and ECE rear fog lamp and reversing lamp standards are more or less identical. But some (not many) states require SAE markings on all exterior lights, and a subset of those states (even fewer) actually look while they're inspecting vehicles. Aside from the expense and difficulty getting ahold of this half-and-half light in America, you'd wind up with less output (less light) than if you go ahead with your original plan of a one-plus-one setup.