no difference. GSC MAXX  have ONE hall only, just u see the MAXX1 is actually separate section only in the SYSTEM of the seating number and booking.
the MAXX1 actually for the peeps who buy at the ticket counter and not by online booking at first.

But they opened it when the system detect on the MAXX nearly fully book by online and automatically opens MAXX1 for online booking that supposedly open for the people who buying @ the counter.

I dunno much, my friends who working @ there told me this.