What do you mean by barcodes? Are you referring to the string of numbers,
are they in barcode font, or are they images?

If it's just a string of numbers to compare, I've used this feature in the
past

https://support.office.com/en-us/article/Highlight-patterns-and-trends-with-conditional-formatting-in-Excel-2016-for-Mac-c3130a89-7ebf-41ac-ab93-e8f58bb42844


On Fri, Nov 10, 2017 at 4:16 PM, Kyle Breneman <[log in to unmask]>
wrote:

> I have 2 Excel files, each with a column of barcodes.  I am supposed to
> determine which, if any, of the barcodes in the first file are also present
> in the second file.  Is writing a short Python program the best way to do
> this, or is there a more efficient way?  (There are about 300 items in the
> first file and about 1,000 items in the second file.)
>
> Regards,
> Kyle
>