83111-101 compatibility

Modular intercom system: M251381M speaker-camera-module + 51381SP3 button module. I am not sure is this codes international, but. Normal Abb/Busch-Jaeger intercom system with traditional keyboard. https://www.asennustuotteet.fi/catalog/20211/Moduulit_FIN1.html

EINBAU SYSTEM is 83110-500 speaker unit, 83501-101-500 camera and 83111-101 button extension unit.

My question is simply, and I asked this about 2 week daily from Busch-Jaeger but looks it is closed. They does not answer email. So. Is it possible connect 83111-101 button extension unit to M251381M speaker camera unit? So, I want connect this button extension 83111-101 to "standard" speaker/camera unit- M251381M, M251382M, M251381A-A or even try it with M21381K-A. Of course "test it", but einbau modules are not available here. So I must order it via amazon, ebay etc, and not so easy.

So- 83111-101 button extension unit, possible connect it to "standard" system?