Michael, the flaws do not need to exactly correspond. A flaw can occur through the blade at an agle. If the one on the reverse side is even close to the patch, then for me, this would be a good enough indication of a flaw that occurred during manufacture.
I also do not understand "blow hole".
Flaws can occur for several reasons, mostly either a cold shut when welding, or because of a degree of hotshortness in the material. Whatever caused it is not important:- its there, so can it be fixed? That is what the maker---or maybe owner would have asked himself. This inlay, or inset, or patch or whatever you like to call it, would probably serve the purpose.
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