I have read neither, but at a glance (yay Amazon) I can tell you that this isn't even remotely similar. Dreaming in Code isn't a technical book; it is a first-hand account of an actual FOSS project, from its inception to its first stable release, and all of the ups and downs along the way. Rosenberg also takes time to explain the history behind the various project management phenomenons the project experienced. In many ways, it reads more like a story than anything.
In short, I definitely still recommend it.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.