Yes, the poem or verses in The Secret can relate to multiple places/locations.... like Forrest Fenn's Poem. The one advantage with The Secret is that there are also images to go with those verses, which contain more clues to help determine exact spots.
However, as the show demonstrated, and obviously from the fact there are still 10 casks yet to be found after more than 30 years, that doesn't always help either. (although some casks, like the St. Augustine cask shown in the episode, most likely would be found today (and since the power of the internet), if the areas hadn't changed over the years since burial.)
Still fun, because if a site can be determined, and permission to dig is granted, then a treasure could be found!