Hi,

Code:
on *:TEXT:!xxxxx:#chan1:{
  var %a = #chan2
  if %a ischan { msg %a $1 }
  scon -at1 if [color:red]irc.yourserver.net[/color] == $!server && %a ischan $({ var %b = $cid },0) 
  if %b { scid %b | msg %a $1 }
}

Explanation of the code:

When a person types !xxxxx in #chan1, the script will message #chan2 on the same server, if that is a channel that you are on.

Then I'm trying to find the connection id of the server "irc.yourserver.net" where you are on channel #chan2. If it finds this channel on that particular server, it will change the active connection to that server, and send !xxxxx to that channel as well.

Note, while there's no need for the extra pipe when using scid %b | msg %a $1, I still put it, since if you should ever change this command to relay any text, you could get very unrequired results, because scid will evaluate the copied text first.

Change irc.yourserver.net to the second server.

Greets