Brother, if we look at all those topics in great detail you can find such differences in every single country, historical region, between cities, hell even villages in the Arab world. Even in the same family and between brothers you can find differences if you want to! The point here is that Palestinians and Jordanians (like most other Arab to Arab relations) have 1000 times more things that unite them than things that divide them.
Let me give you an example. In Makkah people hardly ate seafood traditionally. In Jeddah 85 km away they always ate a lot due to being a port city next to the tropical Red Sea. Meanwhile in Taif 100 km away from Makkah (a city located almost 2000 meters above sea level) people ate many more fruits and vegetables because the environment allowed this. The Hijazi Arabic dialects spoken in those ancient cities of Hijaz and regions and customs were also/are to this day slightly different.
Mecca - Wikipedia, the free encyclopedia
Jeddah - Wikipedia, the free encyclopedia
Ta'if - Wikipedia, the free encyclopedia
Yet there are many more things that unite them than divides them. Same thing with Palestinians and Jordanians and most other Arabs. It's sad that many of us cannot realize this.
But let's fight about which regime is better than the other and let's not forget the Sunni or Shia divide! We need a dose of that each evening and morning.