word choice - What's the difference between 腹切り and 切腹?

I need to add a body to submit my question, so I'll just say the Mortal Kombat seemed to believe that the term 腹切り (はらきり harakiri) was more appropriate for self slaughter (i.e., throwing a boomerang hat that cuts one's own head off); however, I found 切腹 (せっぷく seppuku) used in many novels about Japanese samurai considering suicide due to some circumstance involving their master falling from grace. Is the difference between the two whether it is over personal loss of face or clan-wide loss of face?