Hmm, not a very good comparison. The bulldemon king is a character partially defined by his son Red Boy and his wife, princess iron fan. The plot with the bull demon king was about his cheating with his mistress. So I guess if you remove the important plot story. And his major personality that drove the plot. Then I guess you can compare them.
If it is undeniable that One Piece is inspired by Dragon Ball (stated by Oda) and by proxy Journey to the west, at this point however, I think that OP has deviated from the classic story and has become something unique.
It is hard to say that OP characters are that close to JTW ones or that they will share similar stories.