onepagecheckout.xml

    <customer_account_create>
        <reference name="customer_form_register">
            <action method="setTemplate"><template>novoatributo/persistent/customer/form/register.phtml</template></action>
        </reference>
    </customer_account_create>
    <customer_account_edit>
    	<reference name='customer_edit'>
    		<action method="setTemplate"><template>novoatributo/customer/form/edit.phtml</template></action>
    	</reference>
    </customer_account_edit>