Using Copygram, you don't have to do anything regarding symbols like EURUSDx, EURUSD.pro ... Copygram handles all prefixes and suffixes automatically.
However, some symbols like indices have completely different name between some brokers.
For example : sender send orders like : GOLD and US500 , the receiver has the symbol XAUUSD and SP500
in this case, We need to put GOLD and US500 in the first option and XAUUSD and SP500 in the second option (Only on the EA settings on the receiver side)
First option : GOLD;US500
Second option : XAUUSD;SP500