Jboss Bind differents datasources

I have developed an application in java and i use tomcat. In this web application, i declared in web.xml this resource :

<resource-ref>
    <description>My datasource</description>
    <res-ref-name>jdbc/myDS1</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

When i build my application, i get a war. i copy this war and deploy both of them in tomcat : app1.war and app2.war

Then i define app1.xml and app2.xml where i define the datasource but with different connection information :

for example app1.xml :

<Context crossContext="true" reloadable="true">
<Manager className="org.apache.catalina.session.StandardManager" saveOnRestart="false"/>
  <Resource
    auth="Container"
    driverClassName="oracle.jdbc.driver.OracleDriver"
    maxActive="20"
    maxWait="5000"
    name="jdbc/myDS1"
    username="USER_APP1"
    password="PASS_APP1"
    type="javax.sql.DataSource"
    url="... My Server ...."
    defaultAutoCommit="false"
    validationQuery="SELECT 1 FROM DUAL"/>
</Context>

The same for App2.xml but with different user and pass.

In this way, i can bind different datasource to different instance of my war without modify them.

I would like to do the same in Jboss 4. I know that Jboss is using tomcat. Is there a way to reuse my tomcat conf file ?