savage,
Not sure.
The BC on the 165 xlc is .505
The BC on the 168 xlc is .476. This is the same as the BC for the 168 triple shock. I have not compared the bullet shapes of the Triple shock 168 vs the 168gr xlc.

As you may know in the xlc version the 168gr versions are marketed as a match grade bullet (as far as accuracy only with bullet performance the same as the x bullet) and the bullet shape is definitely different than the shape of the 165 grain bullets.
The 168gr triple shock is also marketed as having match grade accuracy.

You may want to refer your question to the folks at Barnes. Do an internet search on Barnes bullets and their site will come right up.