There have been a few instances where the developers have changed the artwork on certain traits. It can be assumed that cats with the original artwork will never be able to be reproduced (which would make them more rare). Do you have an original?
Serpent – original artwork has thinner upper eyelids
- Last kitty with original artwork: 456675
- First kitty with new artwork: 456709
- Total OG serpents: 3,346
Onyx – original artwork has black whiskers instead of white
Pouty – original artwork had a slight smile
- Last kitty with original artwork: 478717
- First kitty with new artwork: 478733
- Total OG pouty: 95,980
Ganado – original artwork had diamonds that matched the side and chest colors
Frosting – original artwork was the exact same shade of pink as azaleablush
See related post: What’s Rare? What’s Desirable?