propertyCompare

<property name="propertyA" value="'abc'"/>
<log level="custom">
    <property name="propertyA" expression="get-property('propertyA')"/>
</log>
<property name="propertyB" value="'abc'"/>
<log level="custom">
    <property name="propertyB" expression="get-property('propertyB')"/>
</log>
<property name="propertyCompare" expression="get-property('propertyA') = get-property('propertyB')"/>
<log level="custom">
    <property name="propertyCompare" expression="get-property('propertyCompare')"/>
</log>
<filter  source="get-property('propertyCompare')" regex="true">
    <then>
        <log level="custom">
           <property name="filterA" expression="'worked'"/>
         </log>
    </then>
</filter>
<filter  xpath="get-property('propertyA') = get-property('propertyB')">
    <then>
        <log level="custom">
           <property name="filterB" expression="'worked'"/>
         </log>
    </then>
</filter>