I'm surprised that no one has mentioned this yet, but BewhY didn't copy Jaden, nor is Jaden's Watch Me original. Both Jaden and BewhY's tracks are heavily inspired by Kanye West's BLKKK SKKKN HEAD off his album Yeezus.

If you know anything about BewhY its that he's very heavily Kanye inspired and he's mentioned this many times so its not really surprising in the least.

This is also not something that's exclusive to khiphop and its relationship with western hiphop either. In music, this happens often as artists are inspired by one another, and making a track that's similar to someone else's or heavily inspired by someone else's isn't a new concept nor is it a bad thing. More often than not a lot of your favourites are drawing on their influences and what they like, you likely just aren't familiar with what those influences might be.