How to update different custom list items in sharepoint 2010 using EventReciver class

public override void ItemUpdated(SPItemEventProperties properties)
{
    base.ItemUpdated(properties);
    if (properties.ListTitle == "EmpDetails")
    {   
                //save before value of changed item
                string beforeTitle = properties.BeforeProperties["Title"].ToString();
                SPList listEmpHistory =properties.Web.Lists["EmpHistory"];
                SPListItemCollection macthedItems = listEmpHistory.GetItems(GetItemsByTitleQuery(beforeTitle));
                if(matchedItems.Count > 0)
                {
                        foreach(var item in matchedItems)
                        {
                                //change title to new source item title
                                item["Title"] = properties.AfterProperties["Title"].ToString();
                                item.Update();
                        }
                }
        }
}
//query to get all items where title equal source title
public SPQuery GetItemsByTitleQuery(string itemTitle)
{
        SPQuery query = new SPQuery();
        query.Query = "<Where><Eq><FieldRef Name='Title' /><Value Type='Text'>"+itemTitle+"</Value></Eq></Where>";
        return query;
}

If i get u right, u can use something like that