I thought that too, but on the "Do's and Don't sheet" it says:
"We included 2 springs so if you lose or break one, you will have a spare. They both work the same".
I am missing the Dressmaker Button Hole Guide though.
I'm hoping to get a chance to try it out in the near future here to see what it's like. My darning foot experiment a few months ago didn't go so well, but that was with a slant shank, drop in bobbin system, which I've read since didn't give a beginner the best chance at success.