The phrase "it doesn't smell the same" is part of our household lexicon, thanks to my autistic son, who uses the phrase to explain *why* he doesn't like a particular food. We aren't sure whether the issue is actually smell at all, but since he applies it sometimes to some fairly familiar foods, we don't think that it is meant to describe his adversions to things unfamiliar. The phrase might also relate to textures which he finds unpleasant.

Whatever - the phrase is in use now in our house to express an unwillingness to perform a task or try a new experience. If the usage catches on, in 50 years the etymolgists will be completely stymied trying to conjure how it developed. [eg]