role and responsibilities of technical &

Consider the true roles per position and determine what's missing between tech (knowledge)and ops (skills) executions and activities which will bridge that gap between the excutors of technical operations and next above level of management(experience).

Since the company's culture and ethics will bear upon your decisions you take, assess the roles separately for what they are. If looking to combine these roles into one, then "Technical Operations Manager" who would ensure that appropriate ground level support is maintained that cretaes the synergy with pre-defined objectives.

TSP

You can probably get a slightly different description of any particular job name from every poster.

There are some legal ramifications in the application of a job description, depending on what country and what industry you are in. Issues like salary or hourly, overtime exempt or non-exempt, and equal pay for equal work are impacted by the particular description used.

Certification such as those defined by ISO take the job descriptions used into consideration.

A couple of sites worth a look - http://tinyurl.com/c1yp
http://tinyurl.com/c1yv
http://tinyurl.com/c1z0

Ask the person in charge of the position in one location then go to another place that posts the same position and find out that the job description is varied.
Learn to adapt in this field and you will survive
because titles and it jobs always change.