Yes, should be no problem. Just the imagination, that at logic 0 input its not 0V output. 0.25 V voltage drop at logic 1 resp 0.25V output at logic 0 Input are just max levels, means from 6V input I will get 5.5V worst case. Its actually 4 Accus, so we are looking at 4.8 less .5 V. More than enough for the motors anyway, just don't want to waste energy for heating the chips.
And yes, stops anyway, if both outputs are about similar voltage, inertia does the rest (if there was 0.25V between them say)
Case
EDIT: PS: its driven by 4 AA accus, tho voltage will be 4.8 V or less, the 4424 needs more than 4.5 V. MOSFETS then.