It would probably work, but I wouldn't call it a 'good' replacement. You would have to deal with a different package, higher Cob and lower Hfe.
In theory any NPN with sufficient breakdown voltage can be used in that position, but since it is the only gain stage in the regulator (both the STN9360 and the SiC FET are followers) and consumes very little power, I tend to use lower current parts with potentially higher Hfe. The compensation cap value was designed for the KSC5026M, so if the replacement part has lower Cob, increasing that cap may be necessary for the stability of the circuit.