User blog comment:IamJakuhoRaikoben/Chapter 446: The Land Abandoned By God, Review./@comment-5303512-20150727051623/@comment-5894890-20150729220144

Well yeah I guess in terms of use of it was different. However, I think it still narrows down to being a 'star dress' category, not something different. For both situations were talking about, the user inherits the magic of the celestial spirit, which is the main point of star dress. So, overall while Lucy didn't need the key, the celestial spirit king granted the power of it her.