When I did Block #9 I changed up the order for the pieces in the quarter sections because I was debating between two different fabrics for Pieces B and A.
I began by sewing together the quarter section for Pieces E, C and D and sewed them together in that order starting at the bottom of the quarter section template.
I finally settled on my fabric choice for the matching quarter section and I started at the top of the section sewing Pieces D, C, B, and then A in that order.
I am mentioning this because I found that when I sewed together these two quarter sections they matched up so easily with the seams of the pieces for the section nesting beside each other.
It was so much easier than when I had sewn each of the other quarter sections for the other blocks in the same order and had to fiddle with laying the seams on top of each other trying to make sure that everything was perfectly aligned and matched up.
I was surprised that by reversing the order it was easier to match up. Previously when paper piecing I have always done each section in the same order. It reminded me that when sewing regular blocks together we nest up the seams to make it easier. I don't know if this will always work in paper piecing because it depends on the design but I'm certainly going to keep this in mind when I do a second set of these blocks.