Depending on the years involved, Tange 1 vs. Tange 2 can be as low a difference as 2.2 ounces, but Tange Champion 1 vs. Tange Champion 2 may be much different, and I don't know.
The Elite came in a couple of versions, both "early" and "modern" (the mid-80's).
They were two very different bikes, especially the mid-80's Elite RS, which was set up like the Ironman, but with Tange 2 vs. Tange 1 and whatever geometry change the model differenc entailed. I don't know enough about them to really comment other than that.