The differences within the rankings may relate to breadth. If you were to compare a highly ranked program (RHIT) to a more modestly ranked school (Harvard), you will see variance with respect to this:
Engineering Related Majors
Rose-Hulman
Biomedical Engineering
Chemical Engineering
Civil Engineering
Computer Engineering
Electrical Engineering
Mechanical Engineering
Optical Engineering
Software Engineering
Engineering Physics
Harvard
Biomedical Engineering
Electrical Engineering
Mechanical Engineering
Engineering Sciences
As with other rankings, the emphasis you place on them shoud depend on a variety of factors.