A hopper mouse or a fuzzy rat should be fine. There are pretty much no ball pythons that should be fed pinkies, they are way too small. You want to see the lump in your snake after it eats.
The only exception for feeding pinkies if you are assist feeding a hatchling or feeding a hatchling that is extremely underweight to help avoid overloading their system.
Here is a picture I took for size comparison. He already has a rat that size in his belly. The thing I learned with these guys is to feed them a prey item that looks slightly too big. That should be about the perfect size. I did not feed him two,I only put this one in for the picture. The snake was about 75 grams in this picture.
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