The
<admin> tags allows you to define
- routes for the backend,
- the ACL for each module admin section
- and the theme for the admin.
The
<adminhtml> tags
It's the equivalent to
<frontend> for the backend.
It allows you to define
- layout files,
- translations,
- events.
The only think different from
<frontend> is that it doesn't allow routes. (use
<admin> for that).
Источник:
magento.stackexchange.com/questions/15024/differen...