Do different version of Photon 1 interact? How to upgrade?

Options
We have a nearly finished game built around Photon 1.91.

I am building a separate game that should be able to join the above game on Photon.

The two Unity applications cannot see each other's rooms, though they can see their own. I have verified the two games use the same App-Id and are pointed to the same region on Photon Cloud, both using Udp.

We are using the same string for ConnectUsingSettings() on each "0.0.0" and I am using the same command for joining a lobby on each, PhotonNetwork.JoinLobby(TypedLobby.Default);

The only difference I can see between the two is the original application was built in 1.9.1. The new app is 1.9.6.

Do different version of Photon 1 talk to each other? Should I make the applications match Photon revisions?

Answers