1. Add the two books you want to compare to your Bookshelf.
2. In My Bookshelf Recipes select the left View As option under the green search bar (the narrow horizontal lines).
3. Enter the first book title in search.
4. Click Download CSV. Do that for each page of recipes (most cookbooks will have fewer than 250 recipes so will only need one download). If more than one download is required combine them into one spreadsheet.
5. Do the same process with the second book. Copy over the recipes from those spreadsheets to the first spreadsheet.
6. You now want to highlight the unique recipe titles. This is a little complex and depends how familiar you are with spreadsheets. This is the explanation of how to do it on the Microsoft site. Or if that is too hard, just do an alpha sort all the recipe titles then scan down looking for titles that are just on one line.