GrayShadow's 'Giving Gogo Magic' code

Well, I don't know what the first code means, I'm sorry but I don't understand the terms used in regards to what Hex I should be seeing. I can just confirm the stuff begins at C0/D68D.

But, in the second quote, may have found the culprit. C0/A21D and C0/A224, I have 3C1E instead of 281D like you do. I changed. In-game, Sabin still has Mantra, but if I'm understanding this right it's too late (I was stupid and didn't keep a save state from before he joins) to reset what he knows, but for future playthroughs, it'll be fixed?