Shooter Game invite in steam question

I have changed the steam id of the shooter game to 480 the default steam SpaceWar game, my question then is, if i got the Shooter Game and other friend too and the 2 games are running and i send him an invitation, then him can join to my in the Shooter game or that don’t work because i need a dedicated id in steam with a setup ?

Yes the friend invitations work with the 480 and the UE4 example.

can you give me more info about this pls?
i created my game, but i need test for multiplayer…