If you have identical product names within the same category, you can't use Ordinary SEF URL.
Otherwise, both of those products have same SEF URL. (even though they have different product ID's)
By default, only the "Category Name" and "Product names" are used to generate the SEF URL. You should do this to avoid confusion:
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ADMIN EDIT: Sorry i made a mistake. Instead of clicking the "Reply" button for your question. I clicked "EDIT", and your question gets overwritten by my answer. But I already read your question.