I don’t think it’s canistel. To me it looks more like Mamey sapote but I’m not sure. I would think that it would be worth trying to track it back to the source.
Not that many sapotaceae are grafted in CR. If somebody is grafting rare, native sapotes it would be good to know about.
I’m waiting on a sapote from Bocas del Toro to produce so it can be properly identified.
Peter