https://mazuri.com/collections/primate

https://www.amazon.com/ZuPreem-Primate-Diet-Dry-20/dp/B0002ARMVS

They do, primate food.

Not every single one, that would be too expensive, make it the next to last so their confidence is high.

I think it's a nature vs nurture issue, it can be accurate under ideal conditions, but grow conditions vary. With a grain of salt, strains seem to be sort of accurate, but also wildly variant, kind of like dog breeds.