Compare Lists & Highlight Duplicates

I receive a daily spreadsheet which contains (amongst other information) a column of postcodes. I'd like to run a macro which compares these postcodes with a list of other postcodes, and then to colour highlight each instance of that post code in the daily spreadhseet.

I have been able to find and modify a macro but that searches for one post code at a time and then adds a comments box to the cell.

Instead of copying that piece of code and editing it for the several hundred post codes I need to "look up" against, I'd like to know how to create a list of post codes in the macro, so that the macro searches the first post code in the lookup list, finds and highlights each cell instance, then moves onto the next post code in the lookup list, until the end of the lookup list. I would like this as the editing of the lookup list would be much easier than editing paragraphs of code.