That has nothing to do with it. the buttons can still be duplicated at the button board connector. The issue is that the PSP3000 is thinner and the right stick will not fit in the housing. I have only seen one or two of these and the entire stick stuck out above the face about 1/4" They used a Razor board to make the stick thinner.
I may have one or two old Razor boards int he closet somewhere I can give you If I felt you could actually use it.