Do you mean something like this?
$sql = "INSERT INTO prueba (nombre) VALUES ($nombre) WHERE id = '$id'";
1)use mysqli instead of mysql
2) instead of $row[0] use $row[nombre_ID] (if thats what its called)
3) do the same for $row[1] to like $row[nombre]
4) change mysql_fetch_row($query) to mysqli_fetch_array($query,MYSQLI_ASSOC)
6
solved Copy current record to another table with php and mysql