Generally speaking, a listed company refers to a joint-stock company whose shares are publicly traded on a stock exchange (such as Shenzhen Stock Exchange/Shanghai Stock Exchange).
Unlisted companies can be limited liability companies or joint stock limited companies. The biggest difference between it and listed companies is that it has not publicly issued shares, and its shares have not been publicly listed on the exchange.
As for the difference, I don't know what you want to ask, so I will roughly explain it as above.