IF you hold the brake pedals all the way down, it is the same as RTO. RTO IS max braking, which is more than MAX Auto.
From the 744 FCOM:
Rejected Takeoff
Selecting RTO (rejected takeoff) prior to takeoff arms the autobrake system. The RTO mode can be selected only on the ground. The RTO autobrake setting
commands maximum braking pressure if:
• the airplane is on the ground
• groundspeed is above 85 knots, and
• all thrust levers are closed
Maximum braking is obtained in this mode. If an RTO is initiated below 85 knots, the RTO autobrake function does not operate.