[AccessD] Compare Text and Memo fields

Hey All
I have an application that imports ongoing data from EXCEL (each time 
its imported it gets put in a temp table).
Before I attempt to do this.
Is there a function available that allows one to compare memo and text 
fields (between the temp table and the access table) and pull out the 
difference in the text?
I want to be able to indicate to a user if the information has been 
changed or updated, and then show them in a form where within the text, 
the change has occurred.

Thanks