BT's and AB's of the same caliber and weight have a different Ballistic Coefficient (BC) so they will have a slightly different trajectary. My guess that within 300 yds, there would be no signifigent difference where they impact.
If you measure the length of a Ballistic Tip and the corresponding AccuBond, you will find the AccuBond is a bit longer in every case. This is due, according to Nosler, to a slightly heavier gilding metal jacket. This in turn, will increase the BC slightly. As has been stated, probably not enough to worry about inside of 300 meters, but nevertheless is different. Regards, Eagleye.