[trelane]

Chirimoya also originated in the Americas but is a very different fruit:https://en.wikipedia.org/wiki/Cherimoya https://en.wikipedia.org/wiki/Asimina_triloba

Compare, for example, the skin and cross section in photos.

Also compare ranges: chirimoya is tropical, pawpaw is temperate.

[mjh2539]

They are both in the same genus.

[pvaldes]

Same family, different genus (Annona and Asimina). They can't be grafted together. Are compatible at first, but grafts can't survive at long term

Cherimoya (and Atemoya, etc) are often placed among the royalty of fruits. If they are ripe, they are really good. Overripe... not so much. Develop an acrid aftertaste that is a clear warning.