How to compare to list

Just FYI, I have deleted your 2 "test" posts.

Anyway, with regards to your question here, unfortunately, I am having challenges understanding it. Are you referring to a field or a widget that shows a list of options from left and right so you can compare them? If so, these widgets might help.

http://widgets.jotform.com/widget/dual_listbox

http://widgets.jotform.com/widget/visual_multi_select