2 articles and 2 videos are a lot of evidence.
You only addressed the second article.
That's partially because I had limited time. I actually looked at all four, and there are certainly a lot of similarities in the arguments, so they aren't really four separate pieces of evidence all pointing in the same direction. They may be four people each independently coming up with similar ideas, or there may be a certain amount of influence. Either way, most of the arguments are repetitive.
We agree that there are similarities and differences. Our only point of disagreement is your statements about various characters being basically the same person. The only way you get to a conclusion like that is by ignoring the substantial differences. That kind of analysis is too reductive for my taste. Characters can be related without being functionally the same. These characters are definitely related, just not close enough to be considered clones.
If you want an example of what I would consider a clone, take the two Netflix series,
Elite and
Cla$$, which are set in different societies (Spain and India, respectively) but which have nearly identical plots. I started watching
Cla$$ and said to myself, "Wait a minute! I've seen this before." I looked up
Cla$$ online, and sure enough, it's described as an adaptation of
Elite. But it's pretty close to translating the script from one into another language.
In both, a public school in a relatively poor area is destroyed. A philanthropist with suspect motivations offers a few gifted public school students a full scholarship to the best private school in the area (Las Encinas and Hampton International School, respectively). The three students are a serious scholar (though the Cla$$ version is meeker and less sexualized), an underachieving class clown who is a close friend of the serious student, and a brilliant Muslim girl. The serious scholar has a brother who has just been released from prison. Both brothers are attracted to the daughter of the philanthropist, though in Cla$$ only the older brother actually has sex with her. The philanthropist's son and his friends incessantly bully the newbies, though the son finds himself attracted to the Muslim girl and protective of her. When she is given illegal drugs without her knowledge, he rescues her. While she's recovering at his place, she wades out into his pool fully dressed.
It's apparent at the point I stopped watching
Cla$$ that the philanthropist's daughter will be murdered, and that two brother will both be suspects, just as in
Elite.
It just goes on that way. The Indian version has the serious student have issues related to his caste, there's a little less sex, and more about police corruptions. But the characters are all basically the same aside from that, and certainly, they do the same things. If you've seen one, there really isn't much point in watching the other.
In that case, it's legitimate to say that the characters are basically the same people. And there is the added evidence of one series being explicitly labeled as an adaptation of the other. But in the case of Luke and Harry, the characters are not anywhere nearly that similar, and JK Rowling has never claimed that she was adapting Star Wars.