Shapiro's Limits of Orthodox Theology = Jacobs' Principles of the Jewish Faith?

Is it just me, or is Marc Shapiro's The Limits of Orthodox Theology essentially a rehashing of Louis Jacobs' Principles of the Jewish Faith: An Analytical Study?

They have essentially the same goal, namely a discussion of what a modern Jew can believe, and go about it in the same method, by reviewing Rambam's ikkarim and demonstrating that there have been different authoritative views throughout history. Shapiro credits Jacobs with inspiring his work, but it seems a bit sketchy to me... whatever.