Bottom one looks like a Gardtec Novagard 1E , with the clip on ( clip off :-)) strobe lense.Came in a few flavours with / without strobe or just a speaker!!.
I don't think you can mate , on the G3 you just prog one of the zones as keyswitch , but the G4 doesnt have that option.It was designed to be used with the SimpleSet unit on the RKP line.
Check the display when setting , what ever is causing the beeps should be displayed by the leds.It could be zone 1 for example , led 1 will light until the door/zone is closed.
Imagine you wire the contacts using the blue and yellow pairs , back at the control panel connect the blue from one pair to the yellow of the other..then connect the remaining blue and yellow pair into your zone terminals.
I wouldnt fit a pir in a bathroom.
You can do without tampers if you want to.
Take a bit of time to check out the door contact wiring , the 2 silver screws are the "switch" , and wire them to their own circuit.
Have a read of the installer manual , programmable options 00 , there is an option to cancel the strobe at the same time as the bell, far easier than messing about with the wiring or relays..and you can still use strobe confirmation if you wish.
Set one bellbox as SAB and one as SCB , then you...