Well, I reassembled with the magnet on the bottom. When I moved to the front diff, it had the magnet on the bottom plug. So now they match.
Also, the front diff level was down about 1/4 inch from the fill hole when I started. Oil still looked fairly clean, though. Of course, that would probably be expected since the rear diff is always working and the front only in 4x4 mode.
Tomorrow's excitement is the first oil change on my wife's '04. Auto maintenance is fun (when it is 65 degrees and dry outside, anyway).