There are the same number of books in each pile, but Night of the Necromancer is substantially longer than Bloodbones
Those kind people at Fighting Fantasy Towers (a.k.a. Icon Books' Wizard imprint) sent them to me. Night of the Necromancer is the newest of the new Fighting Fantasy gamebooks and is released on 1 April, alongside the brand-spanking-and-really-quite-shiny-new FF format edition of Bloodbones (first published four years ago - can you believe it?).
In case you're not salivating at the prospect enough already, here are two teaser trailers I put together for the books.
Not long to wait now...