Pretty sure prices aren't in dat to begin with, server sends them when you query since it's calculated based off of fame. The zone text dats for besieged are much more likely, since each zone has it's own dialogue tables and it'd have to be added to both NA and JP for each of them as Funk said.
So after looking at changed files, it appears they also updated the zone "Events" .dat files.
For instance, ROM3/0/67.DAT thru 110.DAT were all updated. According to this
/r/ffximodding post, they are the zone "Event" files. Perhaps they have to do with the intel graphics update they did. Someone with modding experience might know more on the specifics of the files.