Epsom salt is empsom salt, only thing you need to check is the ingredients on the back, try get one with no artifical colorings or additives of any kind.
Fully organic way of delivering both magnesium and Sulphur without risk of burn.
It will acidify your medium too so be aware of that.
I use aluminum sulphate and dolomitic lime to ph, which negates the Sulphur.
Personally I use Dolomitic lime and aluminum sulphate to ph medium.