I often have people perform Kenpo Shield "left handed" accidentally because it is so similar to Jap. Sword B.
What they have in common is very similar basic mechanics, with one being "the other side" so to speak, of the other. So, they contribute to each other in that way.
I teach Kenpo Shield in a way as to explain the more precise targeting that is found in kenpo relative to karate. I teach it with the potential of a middle knuckle strike to the solar plexus or a half fist to the throat, and when I get to Short #2, I repeat that lesson.