tusk i

So, i have just got Mengs Abrams kit, but i am a little confused, their are 4 scheme options for the kit; 1 x TUSK II  3 x TUSK I's Now i always thought, in anything, that II was newer / better than I, so how is it that the TUSK II is for 2008 yet the TUSK I's are for 2011, Does this mean...