You can duplicate a group in the Viewer and automatically link the original group to the copy so you can compare the images. You can then apply different windowing or zoom values to the linked groups and scroll them simultaneously for comparison.
1. Right-click the upper left corner of the group you want to duplicate and link.
The pointer changes shape.
2. Drag the group to the location you want.
3. Click Compare Here.
The original group is duplicated and the groups are automatically linked. You can scroll both groups simultaneously and use different viewing options to compare them.