Having to know some people studying in both these institutions, I can state some details about the colleges I got to know from them. There are some key differences between JNTUH and JNTUH CEH. 

JNTUH stands for Jawaharlal Nehru Technological University Hyderabad whereas JNTUH CEH stands for Jawaharlal Nehru Technological University Hyderabad- College of Engineering.

• JNTUH is an autonomous university and just like any other university, it follows its rules. 
• They also update their courses regularly as per the needs of the students. 
• JNTUH CEH is an autonomous college referred to as University College by most students. 
• JNTUH CEH is mainly for technical branches and studies related to it. 
• The University College is under the management and jurisdiction of JUNUH. 
• Jawaharlal Nehru University provides affiliation to various other Engineering and Pharmacy Institutions.

Also the JNTU- H is commonly used to differentiate between the main and the sister universities like JNTUK is for Kakinada, JNTUA is for Anantapur. It is differentiated by the post letter after the main institute’s name.