Mura CMS: These are examples of how to register an event handler/listener for when a user is being saved or updated, and then access the old user bean along with the new user bean.

muraUserBeans.cfm

<cfscript>
  // Place these methods in your Site, Theme, or Plugin's eventHandler.cfc

	public any function onBeforeUserSave($) {
		var newUserBean = arguments.$.event('userBean');
		var oldUserBean = arguments.$.getBean('user').loadBy(userid=arguments.$.event('userid'));

		// if you want to stuff the oldUserBean in the event
		// $.event('oldUserBean', oldUserBean);

		// here you could run any comparison logic between the oldUserBean and the newUserBean
	}
	public any function onBeforeUserUpdate($) {
		var newUserBean = arguments.$.event('userBean');
		var oldUserBean = arguments.$.getBean('user').loadBy(userid=arguments.$.event('userid'));
	}
</cfscript>