Did you post this in 2005 or 2006? The date says 2006, so I will assume an
answer might still be relevent.
Establish a unique index in your Access table that so that you can import
the information from the Excel file without creating duplicate records, but
can add the updated rows.
Then, run a "find duplicates" query on the Access table using criteria that
remains the same between old and updated records (for example, row number,
product type, etc). This will produce a table that contains the old and
updated records. Peruse and delete at your leisure.
If you want to update the Access table with only the new information, I
believe you can use an update query.
-Chris