I have seen a handful of lighter weight (6 3/4 pound) 12-gauge Remingtons, but most are pretty hefty. I have two 28-inch barrel 16-gauges, a KE- and a DEO-Grades and they both weigh within a fraction of an ounce of seven pounds. Certainly not the delightful light weight bird guns that Ansley Fox produced which could be over a pound lighter.
I'm in Alaska right now and can't measure them, but I think the frames are the same size, just slightly different in the height and width of the standing breech.