You know, you can email the designer as well.
I bounght the book, Three Times The Charm by Me and My Sister's Design. I emailed them because they didn't list who the fabric lines were by. They took the time to email me back each design line and designer name for each quilt in the book. And, it was done in an extremely timely fashion. At the time I bought the book, it was near impossible to find the used fabric lines. As they were older fabric lines.
But, I truly wish you luck. Maybe try a coordinating jelly roll or other precut fabric line would aid in matching fabrics.