There is not much difference and there is a LOT of difference! A visa number is assigned to a person entering the USA. It later can become his/her Resident Alien number if alien status is granted. An alien number (usually from your visa number) is assigned to you when you have been granted legal Resident Alien status.
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Most Visa cards start with the number '4' and Mastercards with the number '5'.
I found t his link that may help: http://www.merriampark.com/anatomycc.htm
A Visa card number is the unique 16-digit number embossed on the front of a Visa card. This is your account number and is needed anytime you want to charge anything to the card.
It is the large embossed 16 digit number on a credit or debit Visa card.
"There are several ways to tell if a credit card number is a Visa card number or not. First, Visa numbers always start with the number 4. They are also usually 13 or 16 digits in length."