【从句,Heisnotthesamemanashewas和Shenzhenisnotthecitythatitusedtobetwentyyearsago这两句的as和that可以互换吗为什么】

　　从句,

　　Heisnotthesamemanashewas和Shenzhenisnotthecitythatitusedtobetwentyyearsago这两句的as和that可以互换吗为什么