Loading 2 players scenes into 1 "battle" scene

Hello, so I have Scene_A for Player_A which spawns in the west-map of the game and I have Scene_B for Player_B which spawns in the east-map of the game.

both Players cannot walk trough the middle of the game so they will never see each other but they can shoot bombs to the enemy-map. thats how the game works, but now my question:

when I start the game I want Player_A to wait to find a Player_B and then the game starts and both player's spawns together into ONE Scene to be able to fight each other. Is this actually working or should I try (however???) to do this stuff all-in-one Scene?

• am having a loading Screen to press Play and choose the side-to-play (west/east) (((Now I want this)))-> and then you have to wait until another Player does the same and both Players get started together in one Scene.*

Flowered~