New 52!Khaji-Da is more psycho because the reboot didn't fully affect it
At the end of Jaime's series, the Scarab goes through a very violent phase due to properly rebooting during the KDRA battle. Khaji-Da has demonstrated odd responses to scientific anomalies like magic before—what if the Flashpoint reboot didn't completely reset it, so it stayed in its violent personality?
(I may be talking out of my ass—I've only read Jaime's series and his Booster Gold
backups, and not his subsequent appearances in Teen Titans
and whatever else.)