Once the Product Comparison add-on has been enabled, shoppers will see the Compare option when they hover over any product in the storefront. They can use this option to add products to the list.
It is also possible to add a product to the comparison list from the product details page.
Products added to the list of comparison can be viewed on a special store page that can be reached from the store header:
Customers can use the Differences only check box option to chose whether they want to see only the parameters that differ between the selected products or all the parameters available for comparison.