Combine two table with different column but same value
You should be able to use a simple INSERT/SELECT FROM.

INSERT INTO TABLE_A (
    a_empno
    ,a_checktime
    ,a_updatetime
    ,a_status
    ,a_location
    )
SELECT b_empno
    ,b_checktime
    ,b_updatetime
    ,b_status
    ,b_location
FROM TABLE_B


If your goal is to combine the results from the two tables into another table, you should do as McNets suggests in his comments and use either UNION or UNION ALL.

SELECT a_empno
    ,a_checktime
    ,a_updatetime
    ,a_status
    ,a_location
FROM TABLE_A
UNION   --OR UNION ALL IF YOU WANT TO KEEP DUPLICATES
SELECT b_empno
    ,b_checktime
    ,b_updatetime
    ,b_status
    ,b_location
FROM TABLE_B