"Same difference".
The requirement to meet is to use one of those outputs to connect to the wireless transmitter.
LG TV audio out --------> RP WF70 transmitter ~~~~~ wireless ~~~~> headphones
The connection example shows RCA (red and white) connections on the transmitter. Cannot quite make out the other ports.
Also noted:
"● Expansion headphones can be used in combination with the RP - WF70 transmitter. ● You can use the ID (recognition number) set in the transmitter by registering it in the extension headphones. ● Headphones that can be added with this unit are RP - WF70H. Expansion headphones other than RP-WF70H can not be used. "