“The PA is quite a bit different from Hamas.”
If they are so different, why did they merge? Usually organizations merge that have similar goals and approaches to achieving those goals.
The problem that the PA has in trying to “declare” a Palestinian State is that they don’t even control all of the Palestinian areas. So, the PA has attempted to “paper over” their differences, and give the appearance of - at last - being “in control” of all the Palestinian Territories by way of this unity pact.
However, they tried this unity pact before and it “blew up” ... :-) ...