Sometimes people get confused about PSP version numbering. For instance, PSP 2000 vs. PSP 2002…are they different? PSP 2002 is newer than PSP 2000?
There’s no difference, it just is a version numbering according to regions, aimed to handle movie’s releases (no video games). If you want to know which region your psp belongs to, check the following table:
Note: PSP Go! has no such numbering scheme.