MK Konquest doesn't use OpenBOR. It actually uses its own custom version of BOR done by Gitanno. It will not load with OpenBOR, DarkBOR, BORHed or original BOR.
If I remember correctly Gitanno released DOS, Windows and DC versions, but could not port to Xbox as the source was not available at the time. Now it is, I'm sure he'll be quite interested in making an Xbox version for his mod.
I'll have to investigate Kill Ryu 2 myself.