Found this in a KC Star article. I agree distinguishing them like Pitt does is the right move.
"One can argue that KU should distinguish between those championships. The school chooses not to do that. The 1922, 1923, 1952, 1988 and 2008 banners are uniform in size and appearance.
The same is true at North Carolina, which hangs a 1924 Helms national champion banner alongside its five NCAA championship flags. Pittsburgh identifies the Helms Foundation on its banners for 1928 and 1930.
Kentucky doesn’t consider its 1933 Helms championship banner-worthy."