As per my views section 194C relate to payment to contractors while 194J relate to fee for professional or technical servies. Thus according to section 194C "Technical in nature" means services providing manpower not consultancy. while section 194J relats to consultancy services. Technical services as per section 194J relates to expertise, or knowledge or technical know how.
U/S.194 J -Fees for technical services will have the same meaning as defined under section 9(1)(vii) explanation 2.It implies what ever amount paid for the procurement of technical service and professional service with the intervention of human element is chargeable under this section. U/S.194C- Any payment made towards a contract work including supply of labour for carrying out any work in pursuance of contract is liable.However there are some exceptions are there with board clarrifications, circularNo717 dated aug14,1995