Update: I've run analyses using PE values, Cope values, and % signal change extracted from both. My Cope and PE values are highly correlated (.8 - .9), but my % signal change values are much less correlated (.1 - .4).
I read on a previous posting that % signal change results should be identical for PE and Cope values if there is only 1 EV. I thought I only had 1 EV, but I am new to fMRI and maybe I am misunderstanding what constitutes an EV. It should be noted that I am using the average of 3 runs in this analysis.
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