Woah, fairly confusing. Looks like the base Pro gets the same "pro camera" according to this: https://www.apple.com/iphone/compare/
But the zoom options are different so it's clearly not the same.
They also talked confusingly about optical-quality zoom, or some such thing, on the lower end phones. They made it sound like you can either take a 48MP photo or a zoomed 24MP photo. Sounds like digital zoom to me...
Look at the optical zoom options. Granted, it’s not obvious that the Max has 5x while the base Pro only has 3x.