I'm not weighing any guns side by side. I've not owned a steel Officers in years, so I got the steel weight info from a 1993 Colt brochure I have in my library. It does seem like a lot, but I suspect around a 10 oz. difference is pretty accurate.
Perhaps someone with both steel and alloy guns can weigh them and post an actual value. Wait awhile... I'm sure someone here has both on the shelf.
C