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This year we are using a new supplier and they have provided us a product database of approx. 5k products. About 80% of these products were in our existing database but once we have installed the new database all the URLs will have changed. There is no quick way to match the old products with the new products so we would have to manually match all 5k products if we were were to setup 301 rules for the old products pointing to the new products. Of course this would take a lot of time. So the options are: 1. Is it worth putting in this effort to make the 301 rules? 2. Or are we okay just to delete the old product pages, let the SE see the 404 and just wait for it to index the new pages? 3. Or, as a compromise, should we 301 the old product page to the new category page as this is a lot quicker for us do do than redirecting to the new product page?