You can use the Compare Product Cost feature in Project Editor to compare the Unit Cost field of the products in a project with the Unit Cost field of the products in the catalog.
To use this feature, select the products that you want to compare and click Catalog > Compare Product Cost in the Catalog tab.
You will see the Compare with Catalog Products form.
You can manually edit any product via the Edit button, or you can use the Update from Catalog and Update to Catalog features.
There are price options in the bottom left corner of the interface.
If you want to export the comparison for review, you can export it to either PDF or Excel.