Hi Ted,
as you already noticed, there is no easy way to adjust data from one of the groups to match the other. Even if you omit some slices from the group with a larger slice stack, the TR of that data would remain the same and the spacing of data points in time would still be different for the two groups.
To be on the safe side, I would rescan one of the groups with the parameters used for the other group.
Best,
Volkmar
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