It will be slightly different, Elizabeth (hello and welcome!) - they're all hand-made, so the strapping will be the "same but different" - and there will be different colours in different places. Each individual piece is unique.
You may be able to pick up a single stopper - they do appear on ebay. They were not made to fit perfectly - they tend to just sort of sit on top of the flange. The correct colour would be a teal-blue core, with some yellow bits, cased in clear.