Salts and regular nic at a given nic strength behave identically. There is zero difference.
At very high nicotine strengths salt nic can be more vapable because of the lower throat hit though.
It’s possible that The one where they say you have to have a special coil may be assuming that because you are talking about salts you are automatically talking about very high nic salts. You would also need that for high nic regular juice. Specifically a low vapor MTL coil of some sort.