I've used Collonil nano pro with no issues on all leathers such as Chanel caviar, calf skin, goat skin, washed lamb (chain around maxi) - also Hermes box calf, Togo. Not tried it on the classic lamb yet as I don't own any lamb currently. But I guess it should be fine - after the mandatory spot test first on all bags, regardless of previous success with that type of leather.
I've actually never heard of it. So I gotta look in on it. I've been using waterstop on my Chanel lambskin and it is fine. Even reviewed it on my blog cause it worked for both Celine and Chanel lambskin and other exotic skins without tarnishing the color or changing it. You can read my review here if you'd like to learn more about it. If you do try the carbon pro. let me know. I'd like to know the difference.