RBG survived for quite a few years. Hmmm.
She and Jobs had cancer on the lower portion of the pancreas. As such, it tends to be slow growing and it takes a lot more time to spread. Cancer in the head of the pancreas is located at a place where it is like an large highway interchange where the cells can flow into many parts of the body.
The first is treatable. The second is the one that usually kills you before you know what is going on.