They're all the same in my understanding, just named differently because they have been observed separately before any understanding about PrP existed. And yes, that means they're also all long-lived. These proteins do not decay like more useful molecules or more complex organic matter.

Some of them are the same, but some aren't. CWD is a prion separate from BSE for instance, but BSE is caused by the same prion as Creutzfeldt-Jacob.