A-body 1963-1964 Pushbutton shifter….Plymouth and Dodge the same?

Yes, both Dart and Valiant used the same "typewriter". Even the B and C-bodies use the same one. It's the buttons and trim that are different on the B and C-bodies. The buttons are the same between Dart and Valiant. As for "buttons just pull off", that's true for all of them except the neutral button. You pull on that and you will break the hook tab on it, and it won't stay in place anymore. You need to remove most of the outer parts and then carefully move the Neutral button to the side so you can unhook it from the mechanism.