The cotter hole is too high on the new and the new has a 12-13 threads vs. old 10. Don't know if it's the wrong application or difference in mfr. Two threads looks like enough to throw the cotter too high.
The ball joints are exactly the same except for the location of the cotter pin hole. So under torque (36lbs) the new ball joint places the knuckle nut several threads below the cotter pin location. Several knowledgeable folks have indicated that using washers to fill the space to the cotter pin hole would be ok. I am trying to understand the risk associated with using washers.