They don't expand the same amount at any velocity in my experience--though retained weight is similar with the same diameter/weight bullets.
The Partition tends to open to a narrower width, due to only expanding (at most) back to the partition, where the jacket curls back over the rear base. The AccuBond tends to open wider, because the bonded jacket doesn't have a "stop," like the Partition--and the petals of the jacket tend to open wider. Thus the Partition tends to penetrate deeper.
