Hi,
There is no system in Joomla to notify the user/admin when the account details are updated by the user as far as I know. Maybe a Joomla extension exists for that ? I would recommend to ask about that on forum.joomla.org as maybe someone else knows something about it in the community.
There is also no system in HikaShop to notify the user/admin when the account addresses are updated by the user. That could be added with a HikaShop plugin implementing our address API if you're a developer. You can find information about our API on this page of our documentation:
www.hikashop.com/support/support/documen...r-documentation.html
If you modify the views and emails of HikaShop via the interface we provide, the modifications are stored as standard Joomla view overrides in your joomla template, so you won't loose them when you update HikaShop.