Both bullets are 165gr Hornady flat base bullets but out of different boxes/lots. The seating stem is set the same. The cannelures have a different location on the shank.
They changed the ogive location about 4 years ago if my memory serves me right.. I had to work up new loads and adjust seating depths for the newer bullets. I've also heard they are not as tough as before. One of the reasons for switching back to Nosler partitions. Like I said, Hornady really chaps my hide. However, I'll be using some oldstyle 225gr. interlocks in my 338 win mag, on my elk hunt this year. I haven't bought a new box of interlocks in a few years. Hornady should listen up to some of us real hunters and re-think what they should be offering in their line-up. Get rid of the fu cking pos plastic tipped sob's and pull your (Hornady) head out..