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sql query string differences?

One field of a MySQL table is a string, each character of which is significant.
For example, the string might be: "XftR".
At times, a new entry will be added, for example, "xftR".

Is there a SQL query that can identify and retrieve the differences?
In the example, the result of such a query would be "X" has changed to "x".
The table structure cannot be modified.
MySQL ServerDatabasesPHP

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Kevin Cross

8/22/2022 - Mon