What spec differences? For current models, on same version of software, AP, EAP and FSD share the same spec across all models, be that a Model S, X or 3. Curious what you think differs. Maybe its not clearly stated as there is no difference? Yes, there are differences between screen layouts, but the functionality is the same. There were differences between AP1, AP2, AP2.5, AP3, HW2, HW3, but its all historical, and all current cars are AP3, HW3 on some version of v10.2, unless you are enrolled on the US FSD city streets beta.