This sql script can merge two tables with different columns without carrying out the headache of specifying the whole list of column names. This script can guess the match column names and remove duplicates on insertion process.

merge-tables.sql

SET @target_table = '`klame_new`.`url`';
SET @source_table = '`klame_url`.`url`';

SELECT GROUP_CONCAT(column_name)
 FROM INFORMATION_SCHEMA.COLUMNS a 
 WHERE a.TABLE_NAME = 'url'
 AND a.TABLE_SCHEMA = 'klame_url'
 AND a.COLUMN_NAME IN (
   SELECT b.COLUMN_NAME
   FROM INFORMATION_SCHEMA.COLUMNS b 
   WHERE b.TABLE_NAME = 'url'
   AND b.TABLE_SCHEMA = 'klame_new' 
 ) INTO @columns;

SET @s = CONCAT('REPLACE INTO ', @target_table , ' (',@columns,') ' , ' SELECT ', @columns ,' FROM ', @target_table ,' UNION ALL SELECT ', @columns , ' FROM ', @source_table);

PREPARE stmt FROM @s;
EXECUTE stmt;