In using the pdf from drewtek's link, it appears the major difference between the Elite and Elite II is the front deck layout with the Elite II having the old pro xp layout and the Elite having the PHX layout. The ELITE and ELITE II have a 1" wider front deck than the ProXP and 1" wider rear deck, and the allowances for electronics are a bit higher with the Elite than the proXP.
Are the bottom hulls the Same b/w the phX, Elite, and XP? I see the phX has a little more glass in console and bow shroud. What else?