Question about switches for electric roller shutters (not KNX)

There are indeed rocker switches that have two rockers side by side, left and right. To my knowledge, these are also available as switches, meaning you don’t have to keep pressing, but just turn it on once and the roller shutter goes down.

And then there are switches where you tap on the top or bottom. As far as I know, here as well, you can let it go all the way up or down without constantly holding it.

Examples
a) Busch & Jäger 1785-84
b) Busch & Jäger 6430-214-102

These two control elements each require different flush-mounted boxes, and variant b) is significantly more expensive.

Why and what is the difference? Why can you not simply put switch b) on an under-plaster element for a)?

b) are two completely normal push buttons that conduct electricity when pressed. a) are electronic components that, combined with other components, enable more complex controls. In b), it depends on whether they are push buttons or switches; the distinction here is purely mechanical. Apples and oranges indeed ...

The other way around though, right?

b) is the expensive model, which can also be replaced by timers etc., and a) are then the switches that are basically 2x on/off.

Now, to continue for understanding: With the simple model, I press the right switch, then the left switch remains off (top is pressed down, bottom sticks out) and the right switch is on (top sticks out, bottom is pressed down).

What happens now when the shutter has finished rolling down? Does the switch spring back? Or if it doesn’t spring back, is that a problem? Does the motor know that once it is at the bottom, it is finished and that the switch for rolling down is pressed and latched is no problem, or does the motor now continue to press "against the window sill" downwards?

I probably mixed up a) and b) ;).

Now, to continue with the understanding: In the simple model, I press the right switch, then the left switch is still off (top is low, bottom sticks out) and the right switch is on (top sticks out, bottom is pressed down).

There are double push-buttons/switches and shutter push-buttons/switches. The latter mechanically block each other, you can only press/switch one at a time. <-- That is important!
Both are each connected either to the up or down phase.

When the movement is finished, what happens depends on the motor. The switch cannot snap back, how should the motor tell it to do so? That means the circuit remains closed. Now the motor must either automatically switch off when reaching the end position or recognize the end position independently (our ones do that, for example). Then it still gets power, but the motor is off anyway.

I have b) from GIRA and once a) in the basement - b) is simply nicer, especially since there are also possibilities to integrate them into a control system (central). In addition, depending on the design, the parts also have memory.

I have it downstairs on the ground floor, which remembers (if desired) when you raise/lower the blinds and does it at the same time the next time. So a simple logic - but it's nice.