All of the hardware is identical between all regions. The main
difference is the region code which is only enforced for movies.
Sony have stated that they won't enforce region code lockouts for
any of the games. The meaning of the X and O buttons are reversed
on the Japanese PSP. O is accept and X is cancel which is the
opposite of what is the norm for Sony games/hardware everywhere
else. The UK Value Pack contains a demo UMD disc which isn't
present in the Japanese Value Pack. Another difference it that the
JP PSP has a screen made by Sharp and the US PSP has a screen made
by Samsung.
