Ideally, it should be the same information, otherwise there is no necessary to create and use DOI.
As DOI is the new trend of indexing all publications nowadays, for my own use, most papers can be fetched easily.
If you have a massive paper database need to be indexed, I guess this is the best way to do so.
If you are collecting and building your database from all kinds of sources. Some plug-ins (JabFox, Zotero) can import corresponding information into your database within one or two clicks. Nevertheless, DOI is often written next to the paper title. Manually, you only need to 'copy-paste-search-import' to create one valid item.
Some needs extra fields such as author names, journal title, etc. Some may fail (very old documents, papers in collection/conference/proceedings tech reports, things like this.).
But overall, It is far more convenient than Google Scholar, not to mention the limit set by Google.