Even though ROO and Shamrock are identical and manufactured on the same line, it is possible that one was built earlier when there was no outside storage and the other after the plans were changed and it was added. Just because it may be a 2013 or 2014, FR routinely will make changes during the year and those may not/usually are not reflected in the brochure.
Our 2013 Rockwood TT has interior fabrics and trim from the 2012 season....which is fine since we preferred it over the "current" season. We also have rear decals from 2012...they use whatever is in stock until it's gone.