Wireless compatibility

I dont think i posted the question very well. I have a secuplace alarm, but need an extra wireless PIR (they are 2 way 868mhz), but they are obsolete now and wondered if another manufacturers wireless PIR , if its 2 way and 868mhz would work?
 
The answer is still NO.

The panel and the sensors have to speak the same digital language for them to work together.
 
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