This is the sickening part, I think that they are the same (but don't quote me on that, just what I heard someone say once.) but it also depends what years you are talking about, because there are three different types from 89-97
The 89-93 SC AOD had some stronger parts than the other other AODs, most noteably the "A" servo. The V8 may have gotten the same tranny, I am not sure on that.
The 94-95 SC got the 4R70W tranny that was a stronger AODE unit with wide ratio gearing.