Return on Capital / Return on Invested Capital?

Is there a difference in the 2?

In Schweser, ROC is defined as EVA / invested capital, where invested capital is :

long term debt + Stockholder’s equity

But, on a EOC question (vol 5 pg 191, qst 33 credit analysis chapter), the denominator for pre-tax return on capital is:

short term debt + long term debt + stockholder’s equity

anything i miss here?