I'm not exactly sure what your composition is supposed to do, but
in my tests in my own compositions those two kernels produce the
same results. I've attached one that takes a video input, and
renders it with each of your included kernels side-by-side. I
can't figure out how to demonstrate the bug with your composition,
but if you can, it sounds like a bug that should be filed.
Well with the video input I am certain you won't see the problem.
