On Wed, 20 Nov 2013 01:07:03 +0000, John Rumm wrote:

Basically, if I bought another two interlinked alarms that were a
different make could I simply replace the current two by copying
the
connections?

Alas no... it might work but there is no guarantee. Stick to the same
brand as already fitted.

Read what is written. Mixing and matching makes probably won't work
but the OP intends to buy two new alarms and replace the two old
ones.

AFAIK all mains interlinked alarms use 3 core and earth so it would
just be a case of wiring in the new bases as per their instructions.

--
Cheers
Dave.