Fatal Error Bendy is a corrupt husk version of Bendy, similar to Fatal Error Sonic, yet they do not have the same "Fatal Error"  behind their creation.  They were both created by IRIS, or Fatal Prime, but Fatal Error Bendy is an amalgamated copy of Fatal Prime that goes by the name "Fatal Alpha".  Fatal Alpha does not show hostility most times, unless if you anger him or get in his way.  Unlike Fatal Error, Fatal Alpha is also very territorial, and tries to drive those who come across him away.