Technically it's not the same.
Strictly speaking a certified document is verified as a complete document to being a true and authentic copy of the original. In itself it doesn't mean that the original document was genuine, only that the certified copy of the original is a true copy. Certification may be done by the same categories of professional who would countersign a passport photo etc.
Notarizing is usally done by a Notary Public to verify that the execution of a document, or the identity and signature of someone has been acknowledged and witnessed personally in the notary's presence. It does not mean the contents of the document has been verified or authorised in any way.
Hope this helps.