Not necessarily.whether is HZJ79, GRJ79 or HZJ75 , all have the same tray or wheel arch, am I right?
HZJ75 and HZJ79 have different length trays, since the cab is longer in the HZJ79 the tray is shorter.
Without measuring the wheel arch in the GRJ79, and comparing it to the HZJ79 or HZJ75, there is no way of knowing for sure.
It seems like the wheel arch must be larger in the GRJ, going by the flares you bought.