How is this different from PSP titles? (Sorry, Phantasy Star noob)

#1 Posted by spexwood (25 posts) -

I jumped into Phantasy Star with Phantasy Star Online 2 Portable (or whatever the title is called).  Ever since then, I became addicted to the game, and thus the series.  The SciFi world, the character creation, the role-playing, ... EVERYTHING!

I just want to know if this is the same game as the PSP title (Phantasy Star Online 2 Portable).  I already made the mistake of buying Disgaea 3 for the Vita (which is the system I am hoping to get this game for BTW) when I already had it for the PS3.  I thought they were different games because the titles were slightly different (PS3= Absence of JUSTICE, and Vita= Absence of DETENTION), but they are actually the EXACT same games.  I just don't want to repeat the same mistake by buying the exact same game as the PSP version that I already own and play.  If they are the same, then I'd rather just stick with my PSP version.