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So I have run two jobs (div-1 and div-2) with all even cores (8-0) and they are binary identical expect for casa-*.log, casa.out and imaging.sh. (div is short for divergence. I needed a new name.) This is is just a baseline and it works as expected. Next, I ran div-3 which uses 2 even and 6 odd cores (2-6). There the prenorm residuals in cycle0 are identical between div-1 and div-3. The prenorm residuals in cycle1 are all different between div-1 and div-3 as is the top-level debug-awp.residual.tt0 and debug-awp.image.tt0.
All cycle0 products are binary identical between div-1 and div-3.