Not through any in game systems. You could find someone that you trust that can add gold on S6, then do a trade with the player give them the gold on S5 and him give you the gold on S6.
But don't do this with anyone you don't know because some player might try to scam you. Make sure you do it with a friend that you trust completely.
I know a few players that have a character on a different servers. But it requires both players to have characters on the other server.
Player A needs 10 Tramp Masters on S4.
Player B has 10k Rep on S4.
Player A has 10k Rep on S5.
Player B plays mainly on S5.
Player A trades 10 Tramp Masters on S5 for 10 Tramp Masters on S4.
I've seen some of the above happen before for like players in the same alliance, but play on opposite servers.