How to Find Source Table Updated Rows using Tsql Script

Hi Folks,
i have 2 tales Source table and Staging Table. yeaterday I have Imported 24 Million Records From Source table into Staging table. These Table Contain approxmately 42 columns. So today may be some of the updates happend in Source table rows. ID is the
Unique column.
So may I know which rows are Updated compared to Both tables using Tsql Query. (all 42 Columns might be updated ) .
usually new rows also appeard in sourcetable. I want only Which are Updated not New rows!.
Thanks in Advance.

SELECT Source.*, Stage.*
FROM Source
FULL OUTER JOIN
Stage
ON Source.c1 = Stage.c1
AND Source.c2 = Stage.c2
AND Source.cn = Stage.cn
WHERE Source.key IS NULL
OR Stage.key IS NULL;
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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