[Mervier TS700 replacement]

I have a Mervier TS700 which has hard wired PIRs , I'd like to replace the Mervier panel and keypad with the Pyronix 46 and keypad.

 

My questions are:

 

1) Can i replace the TS700 panel and TS700 keypad with the Pyronix Euro 46 and Pyronix Keypad?

 

2) Will I need to replace my existing PIRs with new ones ?

 

Thanks

 

Garry