TBH i didn't check the part# coil was the same as the outgoing unit, so it's probably that.
the old coil had a prong coming out of the resin area, which was tack welded onto the magnet, but the new one doesn't have this, i didn't think too much of this at the time, but it points to it being a different part.
can i just buy a separate module and use it with the coil i have, or do i need the coil with built in module?
only reason i ask is that i can't see any coils at bunnings, and no coils with module on ebay, the only one i've found for post 1996 online is $128 new.