Yes, in the case of passports, the passport number is the travel document number. However, for other travel documents like visas and Green Cards, the numbers are different.
Visitor (tourist) visas and other travel documents for entering the U.S. The visitor visa is a type of nonimmigrant visa for people who wish to temporarily enter the U.S. There are two categories: B-1 for business travel. B-2 for tourism and medical treatment.
Use Form I-131 - Application for Travel Document.
U.S. passport. U.S. passport card. DHS trusted traveler cards (Global Entry, NEXUS, SENTRI, FAST) U.S. Department of Defense ID, including IDs issued to dependents. Permanent resident card.
A travel document lets the U.S. government know about your travel plans. This is for anyone who is not a U.S. citizen but is living in the USA. You can use a travel document instead of a visa as proof of travel authorization. You must get your travel document before you leave the country.
Passport, Travel Visa and National ID Card Proper identification is the foundation of international travel. As a result, you should ensure to always have an official identification document with you. You can even consider having multiple documents such as your passport, national ID card or driver's license.