Coptic Bookbinding- Part Two

Loved your tutorial and your response to teeganwhite answered my question about using the the hole in the side of the book board.  While searching the web I have seen some beautiful examples of Coptic binding that include ornate stitches on the front and back boards. In some the decorative stitching doesn't seem to always line up with the Coptic stitches on the spine, additionally in some examples the binding stitch holes on the front and back boards are different distances from the spine.  Are these just a variation of Coptic binding or are they a different stitch altogether? I've tried importing photos of what I mean, in case my discription of the techniques are inadequate, but was unsuccessful so I've provided links to an example of each.
paperiaarre.blogspot.fi/2016/0…
lilbookbinder.wordpress.com/20…
Can you explain these techniques or recommend where I can learn about them.