Dec07 Stalla books

I sat December 2007 Level 1 exam and failed; now preparing for June 08 Lvl 1 and still using the old Dec07 Stalla Books. I’ve compared the LOSs in the Economics section between the old Stalla book and the latest CFA insitute textbook and they seem identical. How safe do you think it is to rely entirely on Dec07 Stalla books for June exam? IE, has the curriculum changed much since the December exam? Thanks in advance for any help, guys.