Create users identified by the same password as another user in MariaDB 10.0.X
CREATE USER has number of forms. You can provide the plain password as well as already hashed value stored in the engine:

authentication_option:
  IDENTIFIED BY 'string' 
| IDENTIFIED BY PASSWORD 'password_hash'
| IDENTIFIED {VIA|WITH} authentication_plugin
| IDENTIFIED {VIA|WITH} authentication_plugin {USING|AS} 'authentication_string'