You cannot decide exactly has a copyright infrigement happened when you compare two images. There's no measurement tool for it. Every case is different.
Even in case you see that the other image is only a recolored version of the first image, it's not sure. Why: Both of them can be slight variations of a third image which is in public domain. Or this all happens in a place where copyright is not a relevant thing at all.
As well both images can be totally different, but somehow the maker of the first image can extract one detail which seems to be exactly replicated in the other - at least, if some visually easy transformation is applied such as stretching, rotation or recoloring. If the maker of the first image or his lawyer is clever enough, he can build a plausible story how just this detail is the decisive part of the whole case. If he's lucky and prepared the case carefully, he can succeed to cash every penny that the maker of the second image has got. It's not what the other has done, it's what the first can persuade the court to believe.
Sometimes finding the right detail can be easy. Think for example a fast food restaurant who has an yellowish W on red background. If the restaurant is well visible and seems to have got money, quite soon someone knocks the door without thinking to bring money in, I believe.
Finally the copyrighted thing or the thing that the creator claims to be the most essential thing can be a relation, it's not at all a geometric shape. Nobody can be sure has he noticed all relations in an image. Maybe not, if someone knocks the door and wants his money.
In your example one can find quite many same relations. I have no knowledge of does the first creator of them consider them essential nor could he persuade the judge in a court of law think they are essential.
The question has also the ethical side. Do you think that I would buy your maybe finest quality and flashy work if I suspected you have taken an already existing work and carefully applied all your knowledge to make an unprovable variation.
Suspect? I maybe could somehow see the sameness despite all of your efforts or the creator of the original (or his friend or your enemy) succeeded to make me suspicious or you have one case behind you where you already have been caught.