This is an simple question to answer. If you want to use a reagent, and you don't know which one to use, use the one referenced in the document you're trying to follow. There are other grades of compound, and other ones with slight chemical differences (that you can't understand, but we can fix that in time,) but you can't use those. Unless you test them out first, and then you know if they work or not.
Hey, I said the answer was simple, I didn't say it was inexpensive or complete.