Do you mean HK style wonton? If it is referring to wonton, then it is a subtle difference. Hong Kong wonton tends to have a higher ratio of shrimp to pork in the filling. Main Canton wonton tends to have higher ratio of pork to shrimp ratio in the filling. This is not a black and white, hardline difference. There are sufficient overlapping. There are other small differences too.
To most outsider, the difference is so small that they don’t care. I hate to say it… it is like people talking about New York style pizza vs California style pizza. For people who cares about pizza, that is a huge deal. For a lot of people, they don’t care.
