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The Zync card was the exception, there were 2 versions one NPSL same underwriting as the other charge cards, and the hard limit card $500 CL with auto-paymet via your checking account each month or $250 without.
The only real difference other wise is the willingness to pay the AF each year.
It doesn't make any sense to apply for 2 Amex charge cards. They have the same underwriting standards which are pretty low, and the second card will not get a sign up bonus.