Right now I wouldn't be so foolish as to compare Bellingham to Zidane. Zidane is a proven legend. He was a great player. I wouldn't say Bellingham is a bad player. There is no doubt that Bellingham is very talented. But we are not sure if he can be a legend like Zidane. Bellingham is only a 19-year-old young player. He has enough chances to join the ranks of the best players in history. If Bellingham's fitness is right and he works hard, I believe Bellingham will become a more unstoppable player in the future.
They play at different positions and have different styles and it's not fair to compare them with each other.
Zidane is like a play maker, a traditional number 10 and in modern football, in the last 10 years, we barely see such players. Bellingham is a player who plays as a box-to-box midfielder and even he upgraded his skills a lot in the last season, he is still not a play maker, not a player like Zidane. He does not have skills to become another Zidane and I don't think he has enough skills to replace Luka Modric too.
I think the style of Bellingham is more similar to Toni Kroos but with a little bit better skills for attacking like Lampard and Gerrad, two legendary box-to-box midfielders in England years ago.