[Kalium]

I agree. There's no moral or ethical difference in any way.

Unfortunately for us, the law routinely does see a substantial difference and treats them as such. Due to that, the SCOTUS sees them as different and judges that a law on one is not automatically a law on the other.

In other words, to ban a thing you actually need to specifically ban a thing and not just something that feels ethically like the thing you want to ban.