Board Thread:Manga Discussion/@comment-26732688-20170817210039/@comment-38886678-20190323015755

Stands don't need to have anything in common with other stands, even if the users are related. Stands are made up of a persons willpower, but their abilities are based from the person themselves. That's the reason why no two stands are exactly the same, although they can have similarites. The closest two stands I can think of being the same are SP and tW, which those two have the exact same ability and are both close-range power types, but are different stands of different people.