Do babies have different cries based on what they need? Like their hungry cry sounds different from their diaper change cry.
Yes. They sound different.
Absolutely they do and any one that says otherwise is sadly mistaken
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Search Dunstan baby language 
Yes. You’ll be able to find a lot of this kind of thing online, just look for professionals like paediatricians, midwives etc. Lots of them have online resources and videos.
Yes and their different cries still happen even when they are older. Only it goes from hungry/diaper/hold me to I’m sad, scared, I just need someone to listen, help me ect. And you will know them too.