I was looking at the ogive and meplat shapes, and cannelure, and BC's. They are very close.
A description of the Grand Slam sounds pretty close to a "bonded" bullet:
"original Grand Slam bullets had a two-piece core with the rear being harder than the front. Now, Grand Slams feature a three-component core that is poured into the gilding-metal jacket and flows into a heel pocket. Essentially, the Hot-Cor process, along with the added mechanical lock (at the heel) and thick shank, results in 80 to 85 percent weight retention. Internal fluting makes upset possible at a wide range of velocities, and a higher ballistic coefficient than Mag-Tip slightly flattens trajectory. Grand Slams have a cannelure for applying a crimp and are suitable for the largest game in a given cartridge’s application; however, with the enhanced performance comes a significant increase in price."