Originally Posted by sewTinker
Often, flannel patterns call for a 1/2" seam. That might make a difference in size if you use a 1/4" seam on a cotton quilt.
That's what I was thinking. Even if it calls for the wider seam, you can either adjust your measurements accordingly or sew the cotton with the 1/2" inch prescribed seam.
It should be fine. Do a test block if you can and see if you like the results.