Review every “To check” row
A match based on similarity is still a guess. Two products with similar names are not the same product.
Redirect plan builder
Paste the URLs of the old site and those of the new one. The tool matches each old URL to its new address, flags the ones to check and exports the plan.
Before you apply the plan
Three checks the tool does not do for you.
No match does not mean home page
A discontinued product should redirect to its parent category. Google often treats a mass redirect to the home page as a 404 error.
Test after go-live
Crawl the old URLs again and check that each one answers with a 301 redirect to the planned target.
Where this tool comes from
I have built redirect plans for a fashion shop of about a hundred pages and for a retailer present in 12 European markets. The method is the same: inventory, matching, sign-off, testing.