AQA GCSE Maths Grade 5-7 Workbook (Collins GCSE Maths)

I bought 1st grade 5-7 booster workbook dedicated for Edexcel exam board before. This time, I bought another workbook is highlighted for AQA exam board. However, the contents are exactly the same in these two workbooks.If the workbooks have emphasized in different exam boards then the style of questions should be adjusted. Otherwise, what is the purpose of showing different exam boards on the book covers but questions have just duplicated.