Can ReHo analysis be used in task-related fMRI study?

Dear all,

    As the title I made, can ReHo analysis be used in task-related fMRI study? Also, is the ReHo value equal to Kendall's W (KCC)? If we use a significant region to be a ROI and extract its value, then this value is a ReHo value or KCC value? 

Your help will be greatly appreciated!

Best,

CJ