One is the UnionPay card number and the other is the foreign currency card number.
The Fendou Card I applied for has two card numbers because in addition to a UnionPay card, it also has a foreign currency card. Nowadays, credit cards are generally single-label cards.
After the Fendoudou credit card is approved, two credit cards will be issued simultaneously in the 1+1 mode, a UnionPay single-logo card and a MasterCard single-logo card. The MasterCard single-logo card is limited to overseas consumption and domestic RMB transactions. UnionPay cards can be used.