I am not that good on my cherimoya IDing. The second one almost looks like an atemoya - just never saw a cherimoya that looked like that, color texture, etc. just look off. You will have a little better chance when the fruit is mature, but even then it is real hard to find a fruit that is typical, esp when so many are not 100% pollinated, and thus somewhat odd shaped. I have pix of most of the varieties in the collection at the South Coast Field Station in Orange County, but would be hard pressed to tell which is which. Even El Bumpo can be almost smooth at times, and pretty bumpy, more of the time.