Yeah, that's the point. Either the posts with the same ID are from the same bread, or the report about related content coming from that ID over multiple breads is faked by someone who doesn't understand 8chan. (Not saying which it is, just laying out the logic)
I haven't reviewed the specific alleged posts in question. A good starting point is seeing if the post IDs are very close together, anything from the same bread will be within 1000 post numbers. (Since some get deleted, I would give a bit of margin over 751.) If alleged posts with the same ID have post IDs that are more than 1000 apart, that's a signal of a fake.