Connecting charge port and speaker antennae

When replacing the charge port, the speaker and charge port antenna are disconnected from the logic board and then, obviously, need to be reconnected.

1. Can each antenna be connected to either port on the logic board or do they need to be to their original location. On the iPhone 7 Plus they snap in side by side. Easy to get them confused.
2. Any tricks on getting them to snap into place? They either go right on, or it’s a battle.
3. What is the function of antenna that comes off the charge port?