One Private Key on Two or more OpenPGP 2.0 cards?

[Sean Wilson]

If I generate a brand new key pair and then add the key to an OpenPGP
2.0 card all works perfectly. But if I want to add the same key onto
another OpenPGP card (as a backup) I get the following error in Thunderbird:

Error - decryption failed

gpg command line and output:
C:\Program Files\GNU\GnuPG\gpg.exe
The SmartCard D2760001240102000005000000430000 found in your reader
cannot be used to process the message.
Please insert your SmartCard D27600012401020000050000003F0000 and repeat
the operation.

Obviously if I insert the first card it decrypts the email no problem.
What is the correct method to use to have the SAME private key on
multiple cards? The reason I want to do this is so that I can have a
"production" card, a backup card and an offsite card. How do I
accomplish this?

Thank you.
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