The majority of Grizz I encounter are roughly the same size as the one in the pic from Colorado. None have been anywhere near the size of bigger bears found in Alaska.
Thats not to say they can’t get big. The biggest Grizz that I heard of in Alberta, was shot by R. Eben in 1944. The estimated wieght of the Grizz was 1000+ pounds, with a 25 6/16ths skull.
There may have been bigger Grizz killed in Alberta but I have found no evidence of it.