Would my Telia X1 modem work with Elisa broadband?

Hi,

Previously on my apartment building there was an agreement with Telia but now this has changed to Elisa. I am kinda worried that my modem purchased from Telia won't work. The connection is via network plug (Ethernet connection).

I read somewhere in the community that i need to share the MAC of the modem to customer service is that right?.