Math Curriculum for Gifted Students: Lessons, Activities, and Extensions for Gifted and Advanced Learners: Grade 5 2nd Edition

I bought this book and its 3rd and 4th grade counterparts to use with my gifted students. Imagine my surprise when I opened the table of contents and found them to be identical to the "Challenging Common Core Math" series books, which have a copyright of 2016 (except they removed references to "Common Core" within the lessons and just had the correlation at the end). Those are good books, but I was looking for something different, not completely identical. Perhaps there should have been a note in the description indicating that these were essentially just renamed instead of the "New!" that was advertised.