Palm Kernel is approx 2% less in cleansing value than CO. I like using CO/PKO 50/50 in my soaps. As for Palm, it will move your batter much faster than Lard. I have DOS issues with Lard so I use it at a rate of approx 22% and 40-45% Tallow. I will adjust the CO/PKO accordingly since Tallow has a cleansing value of around 8% and Lard 1%. This info is from
soap calculators, so like anything is it an average.
My vegan recipe with 40% palm moves very quickly, and my non-vegan with tallow/lard moves much slower. In my vegan recipe I do cut the Castor oil to 3% or use no castor if I want more than 2 swirl colors. I ran some tests with the same palm recipe varying the castor oil and found even 1% can change how fast it traces. It was pretty enlightening how fast castor can accelerate trace.