Transfer subkey to other keyring

[Jack Bates]

Hello, I want to transfer a subkey from one keyring to another, but I 
get the following error:

    gpg: key 7FABB65F: already in secret keyring
    gpg: Total number processed: 1
    gpg:       secret keys read: 1
    gpg:  secret keys unchanged: 1

Here is the command I am running:

    $ gpg --homedir . --export-options export-reset-subkey-passwd 
--export-secret-subkeys 10D03493\! | gpg --import-options merge-only 
--import

The destination keyring does not already contain the subkey 10D03493 
(and unfortunately it still does not contain it after running the command)

What am I doing wrong?