What is the difference between Technical Consultant,Functional Consultant and Techno Functional Consultant

Broadly, there are 3 areas in SAP [ There can be several other sub-categories ]:
Functional [ like MM/PP/SD ] : Related to business processes and configuration
Development [ also called technical or ABAP or Netweaver programming ]: Related to programming
Basis/Netweaver/SAP/Technical admin : related to system installation and support

a.) SAP developer is related with 2.
b.) SAP Technical consultant is related with 2 and can also be referred for 3. So youneed to check the requirement in details and ensure which one is being referred.It also indicates a higher level of expertise and experience in the fieldcompared to a.)
c.) Techno-Functional is someone with experience in both development [programming ] as well as functional areas. Generally, these are the consultants witha lot of experience in development and by virtue of working with functionalconsultants and users, they've also acquired skills in business process andconfig [ functional ] side.
In any case, for your purpose you should look into details of a consultant's CV and try to match with the resourcing-requirement document.

Technical SAP consultants are generally either programmers or systems administrators.Functional consultants bring value by combining particular business process knowledge, such as financial knowledge, with the "know-how" of configuring the aspect of SAP that pertains to that process knowledge. So for example, a functional SAP FI consultant generally has a financials background, and understands how to configure the FI tables in accordance with a user's business processes

Functional Consultant is the one who has expertise in functional area.Like a Production engineer can offer in expertise in MM(Material Management) or Manufacturing Module has thorough knowledge of Production Processes one who undersatnd the business process of the client and Map the requirement to meet his requirement by tuning the software i.e Module.Who offer the change requuest management.undertake customization.for Example making use of different table in SAP.Technical consultant is one who actually looking at the things technical part of the software For example connectivity required to update the stock at different application.how stock can be updated by the user is it with IP addresses etc.For example some field required to be added in the table this require ABAP Programmer in case of SAP.