Is the long version shown by TCM the original version?

Yes, the long version now shown on TCM is the original. It seems to have been edited back in in the late 90s. It's easy to tell the "restored" footage as its quality is so degraded, sound and picture. (A few degraded scenes actually are in the shorter version that was the general release print both in 1952 and for years after on TV, but when they put back the missing scenes they had to use some of the degraded stock in place of pristine footage to allow for dissolves, fade-ins, and so forth between scenes.) The VHS version released by Turner in the 80s was of the 122-minute film, although the 141-minute version did show up in an earlier VHS from Nostalgia Merchant, though in poor condition. We're having a discussion on another thread about the feasibility of properly restoring the complete film for DVD.