So long as we're talking about it I'd like to explain some console/portable related stuff:
A playable character is defined in two files: (technically 3, see below)
charactername_####.fb (this is when you're actually controlling the character)
charactername_####_nc.fb (this is for the character select menu only)
(note I'm not trying to make anyone feel dumb, I'm just explaining)
With consoles you'll see files in /packages/generated/powerstyles. You can ignore them. The powerstyles are stored in that character's two FB files mentioned above.
charactername_mc_#####.fb are motion capture files for the cutscenes. You'll probably never need to edit these
charactername_xml.fb and charactername_fightstyles.fb do the same thing, it's just that XML2 uses _xml.fb and MUA uses _fightstyles.fb. Also, the contents inside were updated/changed for MUA. These are the characters moves and powers packaged alone, and helps the game remember the powers when you move to a new area of the game.
That being said all I'm really doing is updating the PSP files you gave my by inserting the MUA version of & ps_gambit.engb, talents.engb (both by BliZZ). Then I'm renaming the _xml package to _fightstyles and updating ps_gambit and talents in there as well. Oh, and I'm adding more MUA moves. Basically I'm using the XML2 PSP fbs and just updating and adding what's needed.
Okay, I'm sure that was long, boring and pointless, but now you know.

*EDIT*
I also need Iceman's fb from MUA: iceman_0801.fb. That way I can be sure that I use all PSP stuff to keep anything from crashing.