The equivalent 'Technician' name in Change Module is represented as 'Change Owner'. However you can change the 'Change Owner' name as 'Implementer' from Change Roles secion: Admin==>Problem/Change Management==>Change Roles. However there is an Implementer role defined by default already which you can delete/rename before changing the 'Change Owner' to Implementer.
However we wont recommend to changing the role name 'Change Owner' to 'Implementer' as it does not follow the ITIL standards.
In other case, where to have both Change Owner and Implementer, then you can assign tech people to Implementer after creating the change from Submission:Roles section.
Regards
Sunil