Cleaning kit key

[fj43]

Hello,
in one of my cleaning kit I found a "ab43" key with a flat dorsal profile, while those I know of the same manufacturer and the same year are different, with a more curved back.
What do you think about? Are they all original? If they are all original, why the maker used two different molds?
Thank you for your help, best regards,
Roby

[fj43]

Cleaning kit "ab43"

Hello,
in the first picture key number 1 and 2, that are above are with curved dorsal and the key number 3 under is with flat dorsal.
Best regards,
Roby