72555, that picture of a phase 1 is a fanmade 3d model, not the real thing. That kind of throws your comparison out the window.
As an Admin and longtime member of the official 501st Clonetrooper detachment, as well as having built a full clone suit myself, I think I am qualified to speak on the differences between Phase 1 and Phase 2 armor. There are very, very minor differences. The differences are so minor that the best answer to a thread like this is to say that there are no real differences and that one suit of armor can work for both Phase 1 and Phase 2.