How do I compare two tables with the same column definitions in different schemas?
If you just want to do a quick check, you can always use EXCEPT in you query to identify if rows in 2 tables are identical.

SELECT 'TABLE1-ONLY' AS SRC, T1.*
FROM (
      SELECT * FROM TABLE1
      EXCEPT
      SELECT * FROM TABLE2
      ) AS T1
UNION ALL
SELECT 'TABLE2-ONLY' AS SRC, T2.*
FROM (
      SELECT * FROM TABLE2
      EXCEPT
      SELECT * FROM TABLE1
      ) AS T2
WITH UR;


If you are using Toad, it has data compare features as well.