Took mine off this afternoon for a better look.
The push/pull ones are analogue switched - there are 3 wires to each, a common and an up and a down. Both can be put in parallel. Pretty simple.
The pull/pull ones are digitally switched. They are 2 wire, and are connected together, so there is a circuit with a resistance made all the time. As each paddle is pulled, it brings another resistor into play to give a high signal or low signal. Not so simple. Less plug and play, more plug and no play.
The push/pull ones are from an LCi car.
My car is a late LCi with the pull/pull blades.
Looks like I'm going to have to live with it for a while, until I get my thinking head on and delve into the circuitry inside the switches.