You mean you created nondedicated server "ingame".
Scripts are the same but if i understant it correctly 4 of 10 AI alarm types dont work for clients and that's the reason
why mission feels different for host.
SetAlarmType(1,1); //Shooting
SetAlarmType(2,1); //Enemy shots
SetAlarmType(4,1); //Hear steps (not working for clients)
SetAlarmType(8,1); //Action sound (not working for clients)
SetAlarmType(16,1); //Explosions (not working for clients)
SetAlarmType(32,1); //Sighted
SetAlarmType(64,1); //Injured
SetAlarmType(128,0); //From script
SetAlarmType(256,1); //Friendly shots
SetAlarmType(512,1); //Sights corpse (not working for clients)
They can be turned off (1 is on, 0 is off) but it could be a massive work to mod all favorite missions to client standard.
"Notepad++" has good replace function.