The answer is simple: don't put all your eggs in one basket. You can split the success story into several different materials and publish them in different sources with crosslinks. For example, important technical details of a success story can be put in the text that will be posted on your own blog, and the business and marketing component can be covered in PR materials. So our success story will be able to preserve colors, details and not lose the corporate identity and approach.
The individuality and uniqueness of what you do is what distinguishes you from other companies, so if the technical details of the case being implemented are important to you, if they contain all the salt of what you are doing and some media does not allow an article from -for them - change the media despite its weight or look for other ways to share these important things.
In a word: there is no point in buzzing about the same thing as everyone else, blindly following the established standards of work and the implementation of success stories is also a road to nowhere. Of course, it takes time to learn how to work with this. 1cloud had many success stories before we developed our own approach.