two identical OpenGPG smartcard???

[Armando]

Hi,
I want to have two identical OpenGPG smartcards (with identical
signing-primary and encryption keys)

I generate the keys on the 1st smartcard with the backup option to be
able to store the encryption on the 2nd card...
But then I'm not able to store the primary key as Signing key on the 2nd
card since "a secret key is already stored on a card". In other words
the gpg utility checks if the primary key has already been stored in a
smartcard.

If I manually generate the keys and then I try to store each of them on
both smartcards then I'm not able to store the encryption key on the
second smartcard since only authentication and signing keys appear as
candidate destination keys on the second card. As if encryption key
duplicate is only possible by a backup...

How can I solve the problem?

Thank You!
Armando