Ferts are ferts, it doesn`t matter whether you inject CO2 or not. And using the salts is cheaper. The only real difference with dosing a CO2/non CO2 tank is whether the non actually needs any ferts adding other than what will occur through nitrification etc.
If you need to dose, then I would recommend using the salts from Aqua Essentials etc. They work out much cheaper than off the shelf options.
Dave.