I need to compare two lists by eye, one short and one long and it would be
really helpful if I could get the columns to move independantly (so I can
drag and drop one value from row 225 to row 30 and have them "on the same
page") so I don't have to scroll between rows.

It is like freezing panes, but where they are disconnected in term of
scrolling, so I can scroll down one side of the spreadsheet while the other
side stays put.

Any idea if/how I can do this?