Spy on ebay sellers - Who are dropshipping from amazon

BAsically people are selling items from amazon to ebay. I want to create a tool which lets me compare those ebay sellers items with amazon and if it matches, it should give me a list of urls. So it is kinda like spying on them. In simple words, the tool shpukd compare that seller items on amazon and if it matches it should fetch the url. I want the tool to be able to do 1000s of items in one go. I think you would probably require web scraping knowledge. Message me if you totally understand it! Checkout this software something like this --> [login to view URL]