Change of Job versus Profession
Many KP practitioners confuse between the concept of "change of job" versus "change of profession". 
Both the things are different & have different yogs.
Change of job--is about changing one's employer while remaining in the same field/profession. For example a software engineer may change his job (service) from one company to another but still remains a software engineer.

Change of profession--is about not only changing the employer, but also changing the field/profession altogether. For example, a software engineer not only changes his company but joins an educational institute as a faculty/teacher to teach computing language.