However, most fund companies require funds to enter and leave the same card for safety.

In other words, when you redeem the fund you bought with the bank card that is now bound, the money must be returned to this bank card.

If you just want one more debit card, it is ok to use it together with another bank card.

If you want to change your debit card, I suggest you find an opportunity to clear the fund you bought with this card, and then transfer the money to the bank card to be bound to unbind the current bank card.